AO Smith HPA10-50H45DV Smart Hybrid Heat Pump Water Heater User Manual

Installaon Instrucons and

Use & Care Guide

Keep this manual in the pocket on heater for future reference whenever maintenance, adjustment or service is required.

Retain your original receipt as proof of purchase.

DO NOT RETURN THIS UNIT TO THE STORE

Read this manual and the labels on the water heater before you install,

operate, or service it. If you have diculty following the direcons, or

aren’t sure you can safely and properly do any of this work yourself:

• Call our Technical Assistance Hotline at 1-877-817-6750 or visit:

hp://www.AOSmithAtLowes.com. We can help you with installaon,

operaons, troubleshoong, or maintenance. Before you call, write down the

model and serial number from the water heater’s data plate.

Incorrect installaon, operaon, or service can damage the water heater, your

house and other property, and present risks including re, scalding, electric shock,

and explosion, causing serious injury or death.

AHRI Cercaon® applies to residenal electric water heaters with rated

capacies of 20 to 120 gallon and input rangs of 12 kw or less.

Hybrid Electric

Heat Pump Water Heater

LOW LEAD

CONTENT

100379656_2000812402May, 2024

Table of Contents

Important Safety Informaon .................................................. 3

Geng Started ........................................................................ 6

Installaon ............................................................................... 7

Operaon .............................................................................. 19

Troubleshoong .................................................................... 25

Maintenance ......................................................................... 32

Diagrams................................................................................ 38

Repair Parts ........................................................................... 39

COMPLETED INSTALLATION (TYPICAL)

2 • Residenal Electric Water Heater Use and Care Guide

Water shut-o

valve

Cold water line

Thermal

expansion tank

Drain pan discharge pipe

Drain

Leak detection sensor

Drain valve

Drain pan

Lower element

Upper element

and ECO

Electrical

junction

box

Hot water line

Condensate line (supplied)

Condensate drain

Control panel

T&P discharge pipe

(Do not cap or plug)

T&P relief valve

Intake air

Exhaust air

Intake lter

1/2” (13mm) Conduit Opening

Quick Release

to remove valve body

Automatic cold water

shut-o valve

Note: If copper piping is used, then unions must be dielectric at inlet and outlet.

Residenal Electric Water Heater Use and Care Guide • 3

IMPORTANT SAFETY INFORMATION

SAFETY

Important informaon to keep

Fill out this secon and keep this

manual in the pocket of the water

heater for reference.

Date Purchased:

Model number:

Serial number:

Maintenance performed:* Date:

*Drain and flush tank, clean air filter, clean condensate pan, and remove and inspect anode rod after first six months of operation

and at least annually thereafter. Inspect and operate the Temperature and Pressure Relief Valve (T&P) annually (see the label

on the T&P valve for maintenance schedule). If no label is attached to the T&P Relief Valve, follow the instructions in the T&P

Relief Valve Maintenance section of this manual. See the Maintenance section for more information about maintaining this water

heater.

This product is cered to comply with a maximum weighted average of

0.25% lead content as required in some areas.

This is the safety alert symbol. It is used to alert you to

potenal physical injury hazards. Obey all safety messages

that follow this symbol to avoid possible property damage,

serious injury or death. Do not remove any permanent

instrucons, labels, or the data plate from either the outside

of the water heater or on the inside of the access panels. Keep this manual

near the water heater.

DANGER

DANGER indicates hazardous

situaon that, if not avoided, will

result in death or serious injury.

WARNING

WARNING indicates a hazardous

situaon that, if not avoided, could

result in death or serious injury.

CAUTION

CAUTION indicates a hazardous

situaon that, if not avoided, could

result in minor or moderate injury.

NOTICE

NOTICE indicates pracces not

related to physical injury.

Read and follow all safety messages and instrucons in this

manual.

ASSE 1082 Test Condions

40 Gallon

Model

50 Gallon

Model

66 Gallon

Model

80 Gallon

Model

Water Heater Connecon Size 3/4" NPT

Maximum Seng 150°F (66°C)

Maximum Working Pressure 150 PSI (1034 kPa)

Maximum Flow Rate at Minimum

Temperature Rise

2 GPM

(7.5 L/min)

2.5 GPM

(9.4 L/min)

3.5 GPM

(13.2 L/min)

4 GPM

(15.1 L/min)

Minimum Flow Rate at Maximum

Temperature Rise

0.5 GPM

(1.8 L/min)

0.6 GPM

(2.2 L/min)

0.8 GPM

(3 L/min)

1 GPM

(3.7 L/min)

Maximum Flow Rate at +70°F (+39°C)

Temperature Rise

2 GPM

(7.5 L/min)

2.5 GPM

(9.4 L/min)

3.5 GPM

(13.2 L/min)

4 GPM

(15.1 L/min)

Pressure Drop at Maximum Flow Rate

2 PSI

(13.7 kPa)

2.5 PSI

(17.2 kPa)

3.5 PSI

(24.1 kPa)

4 PSI

(27.5 kPa)

4 • Residenal Electric Water Heater Use and Care Guide

To reduce the risk of property

damage, serious injury or death, read

and follow the precauons below,

all labels on the water heater, and

the safety messages and instrucons

throughout this manual.

RISKS DURING

INSTALLATION AND

MAINTENANCE

Electric Shock Risk

WARNING! Contact

with the electrical parts in

the juncon box, behind

the access doors and inside the top

shroud can result in severe injury

or death from the electrical shock.

Safety and precauons to reduce

the risk of re, electric shock or

injury to persons should be followed,

including:

• READ ALL INSTRUCTIONS BEFORE

USING THE WATER HEATER.

• This water heater must be ground-

ed. See the “Electrical Connecons”

secon found in the “Installaon”

chapter of this manual.

• Install or locate this water heater

only in accordance with the provid-

ed manual.

• Use this water heater only for its

intended use as described in this

manual.

• As with any appliance, close super-

vision is necessary when used by

children.

• This water heater should be serviced

only by qualied personnel. Contact

a service person for examinaon,

repair or adjustment.

• Disconnect power by opening the

circuit breaker or removing the fus-

es before installing or servicing.

• Use a non-contact circuit tester to

conrm that power is OFF before

working on or near any electrical

parts.

• Replace all parts and panels before

operang.

Liing Risk

WARNING! The

water heater is

heavy. Follow these

precauons to reduce the risk of

property damage, injuries from liing

or impact injuries from dropping the

water heater.

• Use at least two people to li the

water heater.

• Be sure you both have a good grip

before liing.

• Unit is top heavy, use an appliance

dolly (with strap) to move the water

heater.

RISKS DURING

OPERATION

Scalding Risk

This water heater

can make water hot

enough to cause

severe burns instantly, resulng in

severe injury or death.

• Feel water before bathing or show-

ering.

• To reduce the risk of scalding, install

Thermostac Mixing Valves (tem-

perature liming valves) at each

point-of-use. These valves automa-

cally mix hot and cold water to limit

the temperature at the tap. Mixing

valves are available from Lowe’s®.

Follow manufacturer’s instrucons

for installaon and adjustment of

the valves.

• The Control Assembly on this water

heater has been factory set to

approximately 120°F/49°C to reduce

the risk of scalding. Higher tempera-

tures increase the risk of scalding,

but even at 120°F/49°C, hot water

can scald. If you choose a higher

temperature, Thermostac Mixing

Valves located at each point-of-use

are parcularly important to help

avoid scalding.

Temperature Time to Produce a

Serious Burn

120°F (49°C) More than 5 minutes

125°F (52°C) 1½ to 2 minutes

130°F (54°C) About 30 seconds

135°F (57°C) About 10 seconds

140°F (60°C) Less than 5 seconds

145°F (63°C) Less than 3 seconds

150°F (66°C) About 1½ seconds

155°F (68°C) About 1 second

For more informaon about changing

the factory thermostat seng(s), refer

to the “Adjusng the Temperature”

secon in this manual (see page 18).

Regardless of the water heater

Control Assembly seng, higher

temperatures may occur in certain

circumstances:

• In some cases, repeated small draws

of water can cause the hot and cold

water in the tank to “stack” in layers.

If this happens, the water can be as

much as 30°F/15°C degrees hoer

than the thermostat seng. This

temperature variaon is the result

of your usage paern and is not a

malfuncon.

• Water temperature will be hoer if

someone adjusted the thermostat(s)

to a higher seng.

• Problems with the thermostat(s),

or other malfuncons may result in

higher than expected water tem-

peratures.

SAFETY

IMPORTANT SAFETY INFORMATION

Residenal Electric Water Heater Use and Care Guide • 5

IMPORTANT SAFETY INFORMATION

SAFETY

• If the water heater is in a hot envi-

ronment, the water in the tank can

become as hot as the surrounding

air, regardless of the thermostat

seng.

• If the water supplied to the water

heater is pre-heated (for example,

by a solar water heang system)

the temperature in the tank may be

higher than the water heater’s ther-

mostat seng.

To reduce the risk of unusually hot

water reaching the xtures in the

house, install Thermostac Mixing

Valves at each point-of-use.

If anyone in your home is at parcular

risk of scalding (for example, the

elderly, children, or people with

disabilies) or if there is a local code

or state law requiring a certain water

temperature at the hot water tap,

then these precauons are parcularly

important.

According to the naonal standard

American Society of Sanitary

Engineering (ASSE 1070) and most

local plumbing codes, the water

heater’s thermostat should not be

used as the sole means to regulate

water temperature to avoid scalds.

Properly adjusted Thermostac Mixing

Valves installed at each point-of-use

allow you to set the tank temperature

to a higher seng without increasing

risk of scalds. A higher temperature

seng allows the tank to provide

much more hot water and can help

provide proper water temperatures

for appliances such as dishwashers

and washing machines. Higher tank

temperatures (140°F/60°C) also kill

bacteria that cause a condion known

as “smelly water” and can reduce the

levels of bacteria that cause water-

borne diseases.

Water Contaminaon Risk

Do not use chemicals that could

contaminate the potable water supply.

Do not use piping that has been

treated with chromates, boiler seal, or

other chemicals.

Fire Risk

To reduce the risk of a

re that could destroy

your home and seriously injure or kill

people:

• Do not store things that can burn

easily such as paper or clothes next

to the water heater.

• Be sure the juncon box cover and

the element access door covers are

in place. These covers keep debris

from entering and potenally being

ignited, and help keep any internal

res from spreading.

• Keep the water heater from becom-

ing wet. Immediately shut the water

heater o and have it inspected by a

qualied person if you nd that the

wiring, thermostat(s) or surrounding

insulaon have been exposed to

water in any way (e.g., leaks from

plumbing or leaks from the water

heater itself can damage property

and could cause a re risk). If the

water heater is subjected to ood

condions or the thermostat(s) have

been submerged in water, the enre

water heater must be replaced.

• Make electrical connecons proper-

ly, according to the instrucons on

page 17. Use 10 gauge solid copper

wire. Use a UL listed or CSA approved

strain relief. Connect the ground wire

to the green ground screw.

Explosion Risk

High temperatures and

pressures in the water

heater tank can cause an explosion

resulng in property damage, serious

injury or death. A new Temperature

and Pressure (T&P) Relief Valve is

included with your water heater

to reduce the risk of explosion by

discharging hot water. Addional

temperature and pressure protecve

equipment may be required by local

codes.

A naonally recognized tesng

laboratory maintains periodic

inspecon of the valve producon

process and ceres that it meets the

requirements for Relief Valves for Hot

Water Supply Systems, ANSI Z21.22.

The T&P Relief Valve’s relief pressure

must not exceed the working pressure

rang of the water heater as stated on

the rang plate.

Maintain the T&P Relief Valve properly.

Follow the maintenance instrucons

provided by the manufacturer of the

T&P Relief Valve (label aached to T&P

Relief Valve). If no label is aached

to the T&P Relief Valve, follow the

instrucons in the T&P Relief Valve

Maintenance secon of this manual.

An explosion could occur if the T&P

Relief Valve or discharge pipe is

blocked. Do not cap or plug the T&P

Relief Valve or discharge pipe.

Fire and Explosion Risk if Hot Water is

Not Used for Two Weeks or More.

CAUTION! Hydrogen gas builds up

in a hot water system when it is not

used for a long period (two weeks

or more). Hydrogen gas is extremely

ammable. If the hot water system

has not been used for two weeks or

more, open a hot water faucet for

several minutes at the kitchen sink

before using any electrical appliances

connected to the hot water system.

Do not smoke or have an open ame

or other ignion source near the

faucet while it is open.

6 • Residenal Electric Water Heater Use and Care Guide

Installaon Accessories

Figure 1 - Flexible connectors use compression

ngs and do not require soldering.

OFF

Figure 2 - Use a non-contact circuit tester to

ensure that the power is o before you work

on a circuit.

Figure 3 - Install a Pressure Reducing Valve if

required.

Flexible Tubing

Condensate Drain

Ø 5/8” ID

Barbs For

Ø 5/8” ID

Plastic Hose

Figure 4 - Condensate drain connecon

Review all of the instrucons

before you begin work. If you

aren’t sure that you can

safely and properly do this work

yourself, call your Lowe’s® store to

arrange for Professional Installaon

(you may also call a qualied person

of your choice, such as a licensed

plumber or electrician, to have the

work done). Improper installaon can

damage the water heater, your home

and other property, and can present

risks of serious injury or death.

Check with your local and

state authories for any local

or state codes that apply to

your area. In the absence of local and

state codes, follow Naonal Fire

Protecon Associaon (NFPA-70) and

the current edions of the Naonal

Electric Code (NEC) and the

Internaonal Plumbing Code (IPC).

The instrucons in this manual comply

with naonal codes, but the installer

is responsible for complying with local

codes.

Massachuses code requires this

water heater to be installed in

accordance with Massachuses

248-CMR 2.00 and 248-CMR 5.00:

State Plumbing Code. Other local

and state authories may have

similar requirements or other codes

applicable to the installaon of this

water heater.

Before you start, be sure you

have, and know how to use,

the following tools and

supplies:

• Plumbing tools and supplies appro-

priate for the type of water pipes in

your home

• Threaded connecons (Figure 1) for

the cold and hot water pipes

• For homes plumbed with plasc

pipe, use threaded connectors suit-

able for the specic type of plasc

pipe used: CPVC and PEX (cross-

linked polyethylene). Do not use

PVC pipe

• For homes with copper pipes, you

may purchase connector kits with

compression ngs that don’t re-

quire soldering (Figure 1). Compres-

sion ngs are easier to install than

soldering copper pipes

• Thread sealant tape or pipe joint

compound approved for potable

water

• Tools to make electrical connecons

(for example, screwdrivers and wire

strippers)

• Non-Contact circuit tester to check

for power (Figure 2)

• Water Pressure Gauge (Figure 5 on

page 7)

• Safety Gloves

Recommended Accessories:

• Suitable drain pan (Figure 7 on page

• Pressure Reducing Valve (Figure 3)

• Thermal Expansion Tank (Figure 6 on

page 7)

• Point-of-use Thermostac Mixing

Valves (Figure 8 on page 8)

GETTING STARTED

Residenal Electric Water Heater Use and Care Guide • 7

INSTALLATION

IMPORTANT: Follow these steps for

proper installaon.

Step: 1

✓

Verify that Your

Home is Equipped

and Up-To-Date

for Proper Operaon

Installing a new water heater is the

perfect me to examine your home’s

plumbing system and make sure the

system is up to current code standards.

There have likely been plumbing

code changes since the old water

heater was installed. We recommend

installing the following accessories

and make any other changes to bring

your home up to the latest code

requirements.

Use this checklist and inspect your

home. Install any devices you need

to comply with codes and assure that

your new water heater performs at its

best. Check with your local plumbing

ocial for more informaon.

✓

Water Pressure

We recommend checking your

home’s water pressure with a pressure

gauge (Figure 5). Most codes allow a

maximum incoming water pressure

of 80 psi/551 kPa. We recommend a

working pressure no higher than

50-60 psi/345-414 kPa.

HOW: Purchase an inexpensive water

pressure gauge available at Lowe’s®.

Connect the Water Pressure Gauge

to an outside faucet and measure the

maximum water pressure experienced

throughout the day (highest water

pressures oen occur at night).

140

100

120

160

180

200

psi

AVOID FREEZING

Figure 5 - Use a Water Pressure Gauge to make

sure your home’s water pressure is not too high.

To limit your home’s water pressure:

Locate your home’s Pressure Reducing

Valve (PRV) on the main incoming

(cold) water supply line and adjust the

water pressure control between 50

and 60 psi. If your home does not have

a Pressure Reducing Valve, install a

PRV on the home’s main water supply

line and set it to between 50 and

60 psi. Pressure Reducing Valves are

available at Lowe’s®.

BACKGROUND: Over the years,

many ulies have increased water

supply pressures so they can serve

more homes. In some homes today,

pressures exceed 100 psi/689 kPa.

High water pressures can damage

water heaters, causing premature

leaks. If you have replaced toilet

valves, had a water heater leak, or

had to repair appliances connected to

the plumbing system, pay parcular

aenon to your home’s water

pressure. When purchasing a PRV,

make sure the PRV has a built-in

bypass.

✓

Water Pressure

Increase Caused

by Thermal

Expansion

Verify that you have a properly sized

Thermal Expansion Tank (Figure 6). We

recommend installing an expansion

tank if your home does not have one.

Codes require a properly pressurized,

properly sized Thermal Expansion

Tank in all homes that have backow,

check or pressure reducing valves (see

illustraon on inside front cover).

Figure 6 - A Thermal Expansion Tank helps pro-

tect the home’s plumbing system from pressure

spikes.

HOW: Connect the Thermal Expansion

Tank (available at Lowe’s®) to the

cold water supply line near the water

heater. The expansion tank contains

a bladder and an air charge. To work

properly, the Thermal Expansion Tank

must be sized according to the water

heater’s tank capacity and pressurized

to match the home’s incoming water

pressure. Refer to the installaon

instrucons provided with the Thermal

Expansion Tank for installaon details.

BACKGROUND: Water expands when

heated, and the increased volume

of water must have a place to go, or

thermal expansion will cause large

increases in water pressure (despite

the use of a Pressure Reducing Valve

on the home’s main water supply line).

8 • Residenal Electric Water Heater Use and Care Guide

The Safe Drinking Act of 1974 requires

the use of backow preventers and

check valves to restrict water from

your home reentering the public

water system. Backow preventers

are oen installed in water meters

and may not be readily visible. As

a result, most all plumbing systems

today are now “closed,” and almost

all homes now need a Thermal

Expansion Tank.

A Thermal Expansion Tank is a

praccal and inexpensive way to help

avoid damage to the water heater,

washing machine, dishwasher, ice

maker and even toilet valves. If

your toilet occasionally runs for no

apparent reason (usually briey at

night), that may be due to thermal

expansion increasing the water

pressure temporarily.

✓

Water Pipe and

Tank Leaks

Leaks from plumbing pipes or from

the water heater itself can damage

property and could cause a re risk.

• Install the provided leak detecon

sensor (see “Step 15” on page 18).

An automac cold water shut-o

valve is included with this water

heater (see “Step 9” on page 13 for

installaon instrucons). These de-

vices can detect water leaks and can

shut o the water heater’s water

supply if a leak occurs.

• Install a suitable drain pan (available

at Lowe’s®) under the water heater

(Figure 7) to catch condensaon or

leaks in the piping connecons or

tank. Most codes require, and we

recommend, installing the water

heater in a drain pan that is piped

to an adequate drain. The drain pan

must be at least 2” (50 mm) wider

than the diameter of the water

heater. Install the drain pan so the

water level would be limited to a

maximum depth of 1-3/4” (45 mm).

Drain

Drain Pan

Leak Detection Sensor

Drain Pan

Discharge Pipe

Figure 7 - A suitable drain pan piped to an

adequate drain can help protect ooring from

leaks and drips.

✓

Water

Temperature

Regulaon

MIX



Figure 8 - Thermostac Mixing Valves installed

at each point-of-use can help avoid scalding.

Install Thermostac Mixing Valves

(Figure 8) to regulate the temperature

of the water supplied to each point-

of-use (for example, the kitchen sink,

bathroom sink, bath and shower).

Consult the valve manufacturer’s

instrucons or a qualied person.

WARNING! Even if the water

heater thermostat is set to a

relavely low temperature, hot water

can scald. Install Thermostac Mixing

Valves at each point-of-use to reduce

the risk of scalding (see page 4 and

Figure 8).

BACKGROUND: A Thermostac Mixing

Valve, installed at each point-of-use,

mixes hot water from the water

heater with cold water to more

precisely regulate the temperature of

hot water supplied to xtures. If you

are not sure if your plumbing system

is equipped with properly installed

and adjusted Thermostac Mixing

Valves, at each point of use where

hot water is used, contact a qualied

person for more informaon.

Step: 2

Verify that the Locaon

is Appropriate

Before installing your water heater,

ensure that:

The water heater will be:

• Installed indoors close to the center

of the plumbing system.

• In a suitable drain pan piped to an

adequate oor drain or external to

the building (Figure 7).

• In an area that will not freeze.

• In an area that is suitable for install-

ing the water heater vercally and

on a level surface.

• Installed where a typical home

appliance sound would not cause a

disturbance.

• Not used for space heang.

NOTICE: Water heater must be level!

INSTALLATION

Residenal Electric Water Heater Use and Care Guide • 9

INSTALLATION

The locaon has adequate

space (clearances) for periodic

servicing. For opmal water

heater eciency in unvented

applicaons, the unit must have

unrestricted airow and requires a

minimum installaon space of 450 ³

(12.7 m³). As an example, a room that

has an 8  (2.4 m) tall ceiling and is

7-3/4  (2.3 m) long by 7-1/4  (2.2 m)

wide would contain 450 ³ (12.7 m³).

NOTICE: This Heat Pump Water Heater

may be located within a required

minimum of 6”/152 mm clearance

from the front side and 12”/305 mm

clearance from the top of the water

heater. However, for future service

consideraons, a minimum of 3 /.9 m

from any obstrucon on the front side

is recommended.

The oor can support the

weight of a full water heater.

Capacity Filled Weight (lbs.)

40 Gallon 470

50 Gallon 573

66 Gallon 796

80 Gallon 921

Your area is not prone to

earthquakes. If it is, use

special straps as required by

local building codes.

NOTICE: The state of California

requires bracing, anchoring or

strapping the water heater to avoid

its moving during an earthquake.

To contact local ulies for code

requirements in your area, visit

hp://www.dsa.dgs.ca.gov, or call

1-916-445-8100 and request

instrucons. Other locaons may have

similar requirements. Check with your

local and state authories.

The locaon is not prone to

physical damage by vehicles,

ooding, or other risks.

Vehicle

Stop

Drain

Pan

Figure 9 - In a garage, install a vehicle stop to

avoid water heater damage.

Avoid locaons such as acs,

upper oors, or where a leak

might damage the structure

or furnishings. Due to the normal

corrosive acon of water, the tank will

eventually leak. To minimize property

damage from leaks, inspect and

maintain your water heater in

accordance with this manual’s

instrucons. Inspect the drain pan,

pipes, and surrounding area regularly

and x any leaks found. Drain pans are

available at Lowe’s®. Leaks are

frequently in the plumbing system

itself and not the water heater.

The unit cannot be placed into

any type of closet or small

enclosure (less than 450 ³),

unless adequate provisions are made

for air exchange (vented or louvered

doors, wall grilles, ducng, etc.). Wall

grilles shall be a minimum size of 22

inches by 6 inches, or provide the

equivalent area of airow (a minimum

net free area of 130 in²).

For small enclosures with a minimum

installaon space of 84 ³ to 449 ³

(2.3 m³ to 12.7 m³), the following

methods of venlaon are acceptable:

• A fully louvered door.

• One wall grille located a minimum

of 12 inches from the ceiling, and a

second wall grille located a minimum

of 12 inches from the oor.

• One wall grille located a minimum

of 12 inches from the ceiling, and

an undercut door providing 3/4” of

clearance (or a minimum net free

area of 18 in²).

To ensure opmal

performance and

serviceability, a minimum

clearance of 6”/152 mm must be

maintained from the front side and

12”/305 mm from the top for access

and serviceability.

Water heaters located in

uncondioned spaces (i.e.,

garages, basements, etc.) may

require the water piping, condensate

piping, and drain piping to be insulated

to guard from freezing.

The air lter, condensaon

drain and controls must be

easily accessible for operaon

and service.

The site locaon must be free

from any corrosive elements

in the atmosphere such as

sulfur, uorine, sodium and chlorine.

These elements are found in aerosol

sprays, detergents, bleaches, air

fresheners, paint and varnish

removers, refrigerants and many other

household products. In addion,

excessive dust and lint may aect the

operaon of the unit (see “Air Filter

Maintenance” on page 37).

The ambient air temperature

must also be considered when

installing this unit. In Heat

Pump Mode, the air temperature

needs to be above 37°F/3°C and below

120°F/49°C for heat pump operaon. If

the air temperature falls outside these

upper and lower limits, the electrical

elements will acvate to meet the hot

water demand. In this scenario, the

heat pump will not operate in either

Heat Pump Mode or Hybrid Mode.

10 • Residenal Electric Water Heater Use and Care Guide

Step: 3

Removing the Old

Water Heater

Read each installaon step

and decide if you have the

necessary skills to install the

water heater. Only proceed if you can

safely perform the work. If you are

not comfortable, have a qualied

person perform the installaon.

Locate the water heater’s

circuit breaker and turn it

OFF (or remove the circuit’s

fuses).

On the old water heater,

remove the electrical juncon

box access panel. Using a

non-contact circuit tester, check the

wiring to make certain the power is

OFF.

WARNING! Working on an

energized circuit can result in severe

injury or death from electrical shock.

Disconnect the electrical

wires.

Open a hot water faucet and

let the hot water run unl it

is cool (this may take 10

minutes or longer).

Figure 10 - Let the hot water run unl it is cool.

WARNING! Be sure the water

runs cool before draining the tank to

reduce the risk of scalding.

Connect a garden hose to the

drain valve and place the

other end of the hose in a

drain, outside, or a bucket. (Note that

sediment in the boom of the tank

may clog the valve and prevent it from

draining. If you cannot get the tank to

drain, contact a qualied person.)

Turn the cold water supply

valve OFF.

Figure 11 - Cold water supply in OFF posion.

Open the drain valve on the

water heater.

Figure 12 - Draining the old water heater.

Also open a hot water faucet

to help the water in the tank

drain faster.

When the tank is empty,

disconnect the Temperature

& Pressure (T&P) Relief Valve

discharge pipe. You may be able to

reuse the discharge pipe, but do not

reuse the old T&P Relief Valve. A new

T&P Relief Valve comes installed on

your water heater (or on some

models, is in the carton with the

water heater).

Figure 13 - Removing the T&P Relief Valve

discharge pipe.

Disconnect the water pipes.

Many water pipes are

connected by a threaded

union which can be disconnected with

wrenches. If you must cut the water

pipes, cut the pipes close to the water

heater’s inlet and outlet connecons,

leaving the water pipes as long as

possible. If necessary, you can make

them shorter later when you install

the new water heater.

Remove the old water heater.

WARNING! Use two or more

people to remove or install the water

heater. Failure to do so can result in

back or other injury.

INSTALLATION

Residenal Electric Water Heater Use and Care Guide • 11

INSTALLATION

Step: 4

Installing the New

Water Heater

Completely read all

instrucons before beginning.

If you are not sure you can

complete the installaon, DO NOT

RETURN THIS UNIT TO THE STORE.

Seek assistance from any of the

following sources:

• Professional Installaon is available

for this product and the work is guar-

anteed. Call your Lowe’s® store to

have this water heater installed.

• Schedule an appointment with a

qualied person to install your water

heater.

• Call our Technical Assistance Hotline

at 1-877-817-6750.

Install a suitable drain pan (if

required) that is piped to an

adequate drain.

Set the water heater in place

taking care not to damage the

drain pan.

NOTICE: Most codes require seng

the water heater in a suitable drain

pan piped to an adequate drain. The

drain pan helps avoid property damage

which may occur from condensaon

or leaks in the piping connecons or

tank. The drain pan must be at least

2” (50 mm) wider than the diameter

of the water heater. Install the drain

pan so the water level is limited to a

maximum depth of 1-3/4” (45 mm).

Verify that the water heater is

set in place properly. Check

that:

• The T&P Relief Valve will not be in

contact with any electrical parts.

• There is adequate space to install

the T&P Relief Valve discharge pipe

and that it can be piped to a separate

drain (and not into the drain pan).

• There is adequate space to install

proper condensate drain tubing.

• There is adequate access and space

around the water heater for future

maintenance. A minimum clearance

of 6”/152 mm must be maintained

from the front side of the water

heater.

• Unit is level to allow proper conden-

sate drainage. An unlevel unit may

lead to condensate draining improp-

erly, resulng in property damage.

• The water heater is installed upright.

DO NOT CONNECT ELECTRICAL

WIRING UNTIL YOU ARE

INSTRUCTED TO DO SO

NOTICE: Connecng electrical power

to the tank before it is completely full

of water (the water must run FULL

STREAM from a hot water tap for a

full three [3] minutes) may cause the

upper heang element to burn out.

Step: 5

Connecng the

Condensate Pump

When Required

NOTICE: If no oor drain is available,

or the drain is above the level of the

condensate line, a condensate pump

must be installed.

Follow condensate drain pump

manufacturer’s instrucons for

installaon.

Step: 6

Connecng the

Condensate Pump

Oponal Overow

Shut-O Switch

Locate the wiring loop next to

the condensate drain

connecon and remove label

(Figure 14). Cut the loop and strip

insulaon o the two ends (Figure 15).

Condensate

Pump Wiring

(Loop located

close to Drain

Connection)

Condensate

Drain Connection

REMOVE

Figure 14 - Condensate Pump wiring.

Condensate Pump Wiring Loop

(Loop Located Close to the Drain Connections)

Wires From

Water Heater

Wires to Condensate

Pump Overflow

Shut Off Switch

Figure 15 - Wiring Loop for connecon to Con-

densate Pump.

Measure the distance from

the wiring loop to the

condensate pump. Cut two 22

AWG wires to correct length and strip

the insulaon at both ends.

Connect the two 22 AWG

wires to the two wires on the

water heater using wire

connectors or other approved means

to make the power connecons.

12 • Residenal Electric Water Heater Use and Care Guide

Connect the free ends of the

two 22 AWG wires to the

shut-o switch on the

condensate pump in accordance with

the condensate pump manufacturer’s

recommendaons.

Step: 7

Install Condensate

Drain Line

NOTICE: Barbed drain and exible

tubing for condensate drain line come

pre-installed from the factory.

• Flexible tubing must be used to

connect the condensate drain to a

suitable drain or condensate pump.

• Condensate drain line should be

installed in condioned areas only.

Install approved insulaon on the

condensate drain line to prevent

condensaon from forming on the

outside of the drain line. Conden-

saon drain lines installed in areas

that are subject to freezing tempera-

tures should be wrapped with a na-

onally recognized heat tape. Install

per manufacturer’s instrucons.

• Do not connect condensate drain

line with other drain or discharge

lines into a single (common) pipe

or line. Each line (condensate drain

line, temperature and pressure relief

valve discharge pipe, etc.) should be

independently run to an adequate

drain.

• Slope the condensate drain line

toward the inside oor drain or

condensate pump.

• The condensate drain line and

connecons to the drain piping must

comply with all local codes.

• If a condensate pump is installed, it

should be wired to shut o the heat

pump in the event the condensate

pump fails or the oat switch in the

pump acvates (see “Connecng

the Condensate Pump Oponal

Overow Shut-O Switch” on page

11).

• Allow enough length on the 5/8” ID

exible plasc tubing (pre-installed

from the factory) to access an ade-

quate drain.

Step: 8

Connect the

Temperature and

Pressure (T&P) Relief

Valve/Pipe

Most T&P Relief Valves are pre-

installed at the factory. In some cases,

they are shipped in the carton and

must be installed in the opening

marked and provided for this purpose

and according to local codes.

WARNING! To avoid serious injury

or death from explosion, install a

T&P Relief Valve according to the

following instrucons:

If your water heater does not have

a factory installed T&P Relief Valve,

install the new T&P Relief Valve that

came with your water heater. Do

not reuse an old T&P Relief Valve.

Install a T&P Relief Valve discharge

pipe according to local codes and the

following guidelines:

The discharge pipe should be

at least 3/4” (19 mm) inside

diameter and sloped for

proper drainage. Install it to allow

complete drainage of both the T&P

Relief Valve and the discharge pipe.

The discharge pipe must

withstand 250°F/121°C

without distoron. Use only

copper or CPVC pipe. Most homes use

copper water pipes, but some use

CPVC or cross-linked polyethylene

(PEX). Use ngs appropriate for the

type of pipe in your home. Do not use

any other type of pipe, such as PVC,

iron, exible plasc pipe, or any type

of hose.

Figure 16 - The T&P Relief Valve discharge pipe

must be installed properly and piped to an

adequate drain.

Terminate the discharge pipe

a maximum of 6” (15 cm)

above a oor drain, or

outside the building (Figure 17). Do

not drain the discharge pipe into the

drain pan; instead pipe it separately to

an adequate drain. In cold climates,

terminate the discharge pipe inside

the building to an adequate drain.

Outside drains could freeze and

obstruct the drain line. Protect the

drain from freezing.

Do not place any valve or

other restricon between the

tank and T&P Relief Valve. Do

not cap, block, plug, or insert any

valve between the T&P Relief Valve

and the end of the discharge pipe. Do

not insert or install any reducer in the

discharge pipe.

INSTALLATION

Residenal Electric Water Heater Use and Care Guide • 13

INSTALLATION

6.00"

MAX

Discharge

Pipe

Drain

Pipe

Figure 17 - The end of the T&P Relief Valve dis-

charge pipe must stop no more than 6” (15 cm)

above a oor drain or outside.

Step: 9

Install Shut-O and

Tempering Valves

Install a manual shut-o valve

(available at Lowe’s®) on the

cold water line that supplies

the water heater. Install the shut-o

valve near the water heater so that it is

readily accessible. Only use valves that

are compable with potable water.

Use only full-ow ball or gate valves.

Other types of valves may cause

excessive restricon to the water ow.

NOTICE: An automac cold water

shut-o valve is included with this

water heater. This is to be installed

on the cold water line near the water

heater. Make sure the module cable

can be easily plugged into the Control

Assembly (within 30”/76 cm). See

included kit instrucons found with

the automac cold water shut-o valve

for further installaon instrucons.

Install Thermostac Mixing

Valves at each point-of-use

(for example, the kitchen sink,

bathroom sink, bath or shower).

Consult the valve manufacturer’s

instrucons or a qualied person.

WARNING! Even if the water

heater’s thermostat(s) are set to a

relavely low temperature, hot water

can scald. Install Thermostac Mixing

Valves at each point-of-use to reduce

the risk of scalding (see page 4 and

Figure 8).

For water heaters that are fed

by a solar water heang

system (or any other pre-

heang system), always install a

Thermostac Mixing Valve or other

temperature liming device in the inlet

water supply line to limit water supply

inlet temperature to 120°F/49°C. Solar

water heang systems can supply

water with temperatures exceeding

170°F/77°C and may result in water

heater malfuncon.

WARNING! Hot water provided

by solar heang systems can cause

severe burns instantly, resulng in

severe injury or death (see page 4).

Step: 10

Connect the Water

Supply

Determine the type of water

pipes in your home. Most

homes use CPVC or cross-

linked polyethylene (PEX). Use ngs

appropriate for the type of pipe in

your home. Do not use iron or PVC

pipe – they are not suitable for potable

water.

The water inlet and outlet threaded

connecons are steel. When

connecng the unit to piping made of

a dierent material, use of a dielectric

ng or a dielectric union conforming

to ASSE 1079 is recommended to

prevent corrosion and potenal

subsequent water leaks at or near the

connecon. Dielectric ngs may be

required by local plumbing codes.

IMPORTANT! A dielectric waterway

nipple is dierent than a dielectric

nipple and does not perform the same

funcon. A dielectric waterway nipple

will not protect the water heater from

corrosion.

Connect the cold water supply

using 3/4 inch Naonal Pipe

Thread (“NPT”) to the BLUE

cold water connecon on the top side

of the water heater.

To avoid damaging gaskets in the ex

lines, use a pipe wrench at the hot

and cold nipples to counter torque

when installing or removing water

connecons. DO NOT overghten.

Connect the hot water supply

using 3/4 inch NPT to the

corresponding RED hot water

connecon on the top side of the

water heater. Follow the same

connecon guidelines as for the cold

water supply.

14 • Residenal Electric Water Heater Use and Care Guide

IF YOU HAVE COPPER PIPES:

If your home has copper water

pipes, you can solder the water pipe

connecons or use compression

ngs which do not require

soldering. Compression ngs

are easier to install than soldering

pipe. Check with local plumbing

ocials to determine what types of

pipe materials are suitable for your

locaon. Do not use lead-based

solder.

Compression ngs don’t require soldering.

NOTICE: Do not solder pipes while

they are aached to the water

heater. The water heater’s inlet

and outlet connecons contain

non-metallic parts which could

be damaged. The proper way to

connect the water heater to copper

water pipes is as follows:

Solder a short length of pipe (about

a foot or so) to a threaded adapter

using only 95/5 n-anmony

or equivalent solder. Aach the

threaded adaptors to the water

heater’s connecons (using

thread sealant tape or pipe joint

compound). Connect the home’s

water pipes by soldering, keeping

the connecons at the water heater

cool with wet rags. DO NOT over

apply joint compound.

Install insulaon (or heat

tape) on the water pipes

especially if the indoor

installaon area is subject to freezing

temperatures. Insulang the hot

water pipes can increase energy

eciency.

Double check to make sure

the hot and cold water pipes

are connected to the correct

hot and cold water ngs on the

water heater.

If needed, install (or adjust)

the home’s Pressure

Reducing Valve to 50-60 psi

and install a Thermal Expansion Tank.

Figure 18 - A Pressure Reducing Valve is re-

quired if your home’s water pressure is above

80 psi.

Figure 19 - The Thermal Expansion Tank should

be pressurized with air to match the home’s

incoming water pressure.

Recirculang Loop

A recirculaon loop is somemes

provided in a hot water system where

it is desirable to have on demand hot

water at the xtures.

We do not recommend this heat

pump water heater for use in

conjuncon with recirculaon loop

systems due to the wide variety

of applicaons and variability in

installaon and performance of

these systems. We can provide the

following guidance that you may use

to determine if this heat pump water

heater will operate at peak eciency

in your specic applicaon.

A smaller diameter size pipe with an

inline circulaon pump is plumbed

to a locaon near the furthest

xture and to a locaon near the

water heater. The pump shall be “on

demand.” This means that either by

manual control (Figure 20) or sensor

control (Figure 21), the pump shall be

iniated shortly prior to the hot water

draw.

A recirculaon loop in your home

provides on demand hot water

to your xtures quickly and helps

migate the amount of wastewater

sent down the drain while you wait,

but hot water may be connuously

owing through your plumbing

system. If your recirculaon pipes

are not insulated well enough to

prevent heat energy loss, then your

pipes will radiate heat throughout

the surrounding areas of your home.

The heat energy lost can cause your

heat pump water heater to work

connuously to maintain the heat in

the pipes.

This heat pump water heater is

programmed with proprietary

soware to ensure the water heater

operates at peak eciency. Demand

for hot water in the plumbing system

will draw hot water from the tank

INSTALLATION

Residenal Electric Water Heater Use and Care Guide • 15

INSTALLATION

causing a heang cycle as the supply

water temperature is much cooler

than the water in the tank. You should

consider alternaves to installing a

heat pump water heater in conjuncon

with a residenal recirculaon loop to

prevent the water heater from running

connuously due to the lower input

of these types of units, potenally

causing a “no hot water” condion.

If your recirculaon loop or pump is

designed to help provide on demand

hot water to sinks, showers, etc.,

and does not present a signicant

connuous heang load, this heat

pump water heater can generally be

used with on demand recirculaon

systems.

Energy savings from this heat pump

water heater will be signicantly

impacted depending on condions

associated with the specic

applicaon. The heat energy lost in a

recirculaon loop system can cause

your water heater to run excessively.

This heat pump water heater may not

be able to accommodate demand.

CHECK

VALVE

HOT WATER

SUPPLY

WATER

METER

DEDICATED

RETURN

LINE

HEAT PUMP

WATER HEATER

CIRCULATION

PUMP

FIXTURE FURTHEST

FROM WATER HEATER

WITH MANUAL SWITCH

FOR INITIATING

CIRCULATION PUMP

COLD

WATER

SUPPLY

Figure 20 - Recirculaon Loop Diagram with

Manual Switch.

CIRCULATION

PUMP

HOT WATER

SUPPLY

COLD

WATER

SUPPLY

CHECK

VALVE

HOT WATER

RETURN

HEAT PUMP

WATER HEATER

FIXTURE FURTHEST

FROM WATER HEATER

WATER

METER

FLOW MONITOR

(ON DEMAND SENSOR)

Figure 21 - Recirculaon Loop Diagram with

Sensor Control.

Step: 11

Ducng Requirements

(oponal)

Heat is absorbed from air entering

the intake side of the compressor

unit on top of the water heater and

transferred to the water inside the

storage tank. Cooler dehumidied

air exing the exhaust side of the

compressor unit is a normal by-

product of operaon. In unvented

applicaons, a minimum installaon

space of 450 ³/12.7 m³ is required,

however, if adequate provisions are

made for air exchange, this water

heater may be installed in small

enclosures with a minimum installaon

space of 84 ³/2.3 m³ (see “Verify that

the Locaon is Appropriate” secon

[pages 8-9] in this manual for more

informaon about required ducng

and vented or louvered doors). The

factory installed duct adaptors can be

used to redirect intake and/or exhaust

air from or to other locaons to

permit installaon in conned spaces,

improve performance and maintain

comfort in occupied areas of the

home.

INSTALLATION LIMITATIONS

There are two duct adaptors; one

connects to the air exhaust side of the

top shroud cover (near the back of the

water heater) and one to the air intake

side of the top shroud cover (near the

front of the water heater). The two

cannot be interchanged. The inlet and

outlet duct adaptors on the water

heater accept 8” diameter ducng. No

addional adaptors are needed.

7”, 6” and 5” diameter ducng is

supported. The table below lists the

total feet of ducng allowed.

For duct diameters smaller than 8”

diameter, the table takes into account

the duct reducer(s) and up to 10 feet

of 8” inch rigid ducng (two elbows)

before the duct reducer(s) at the unit.

Duct reducers must be installed within

10 feet (two elbows) of the unit or

within 2 feet of the duct terminaon.

IMPORTANT: A minimum length of 12”

exible ducng (8” diameter) must be

installed between the duct adaptors

and any rigid ducng.

Air can be drawn from or expelled

to the outdoors, an ac space, or to

another room inside the home.

INSTALLATION

CONSIDERATIONS

The compressor unit on the water

heater is disabled when the

temperature of the air owing to the

intake is lower than 37°F/3°C or higher

than 120°F/49°C. These operaonal

parameters must be considered when

determining if a locaon to duct air

from/to will be suitable.

NOTICE: If the compressor unit is

disabled for long periods of me due

to air intake temperature being too

hot or too cold, the potenal energy

savings a heat pump water heater is

able to provide may be signicantly

reduced.

AIR INTAKE

Outdoor air temperatures will oen

be lower than 37°F/3°C in many

regions during fall and winter months.

Ac temperatures will oen exceed

120°F/49°C in many regions during

spring and summer months. For

units installed in condioned spaces,

ducng outdoor air to the intake of the

unit may place addional load on

Duct Type / Diameter 8” 7” 6” 5”

Flexible 100’ 50’ 24’ —

Rigid 300’ 155’ 65’ 20’

16 • Residenal Electric Water Heater Use and Care Guide

space heang and cooling equipment

unless the air from the exhaust is also

ducted to an alternate locaon.

Air being drawn from an alternate

locaon inside the home may cause

a negave pressure condion inside

that area. As a result, cold or hot air

from outdoors may be drawn into

the structure and place addional

load on the space heang and cooling

equipment.

AIR EXHAUST

The air exhaust from a unit installed

in a garage or any area where

solvents or other chemicals that

emit potenally harmful fumes are

stored or automobiles are located

must never be ducted to any other

space inside the building structure.

This would include all occupied and

unoccupied spaces such as acs or

basements. Potenally harmful fumes

and vapors from solvents and cleaners

or automobile exhaust gases could be

introduced into living spaces.

Cold air blowing from the air exhaust

into an alternate locaon inside the

home may cause cooling discomfort.

Cold air blowing from the air exhaust

into an alternate locaon inside the

home may place addional load on

space heang equipment during fall

and winter months.

Ducng only exhaust air to an

alternate locaon may cause a

negave air pressure in the installed

space. As a result, cold or hot air

from outdoors may be drawn into

the structure and place addional

load on the space heang and cooling

equipment.

Step: 12

Ducng Installaon

(oponal)

Read each installaon step

and decide if you have the

necessary skills to install

intake and exhaust ducng to and

from the heat pump water heater.

Only proceed if you can safely

perform the work. If you are not

comfortable, have a qualied person

perform the installaon.

Aer the desired length of 8”

exible duct has been

determined, carefully cut

completely around and through the

duct insulaon jacket with a pair of

scissors. Using a pair of wire cuers,

cut the wire inside the core duct. Fold

the duct insulaon jacket back and

away from the core duct.

Slide the core duct over the

air exhaust duct adaptor and

secure with a cable e. Seal

core duct with at least two wraps of

insulaon tape over cable e.

Slide duct insulaon jacket

back over the core duct and

the air exhaust duct adaptor.

Use insulaon tape to secure the duct

insulaon jacket to the air exhaust

duct adaptor. Addionally, secure duct

insulaon jacket with cable e. Repeat

procedure for the air intake duct

adaptor.

Add support to the duct work

as necessary with ducng

tube hooks or as required by

local codes. Special aenon must be

given to prevent large droops in the

duct work which could allow moisture

to pool.

The appropriate duct

terminaon shall be added to

the terminaon end of the

duct. This terminaon shall prevent

any debris or rodents from entering

the duct work and shall minimally

restrict airow through the ducng. In

addion, the terminaon shall be

designed to prevent rain from

entering the duct work if terminated

to the outside.

The ow area terminaon

must be at least 40 sq in. to

avoid overloading the heat

pump water heater fan.

Step: 13

Verify Connecons and

Completely Fill Tank

To remove air from the tank and allow

the tank to ll completely with water,

follow these steps:

Remove the ow restrictor at

the nearest hot water faucet.

This allows any debris in the

tank or plumbing system to be

washed out.

Turn the cold water supply

back ON and ensure any shut-

o valves installed on the

cold water supply line are open.

Figure 22 - Fully open the cold water supply

valve (full-ow ball valve pictured above).

INSTALLATION

Residenal Electric Water Heater Use and Care Guide • 17

INSTALLATION

Open a hot water faucet and

allow the water to run unl it

ows with a full stream.

Let the water run full stream

for three full minutes.

Close the hot water faucet

and replace the ow

restrictor.

Check inlet and outlet

connecons and water pipes

for leaks. Dry all pipes so that

any drips or leaks will be apparent.

Repair any leaks. Almost all leaks occur

at connecons and are not a tank leak.

Step: 14

Make Electrical

Connecons

WARNING! Working on an

energized circuit can result in severe

injury or death from electrical shock.

NOTICE: Do not supply electrical

power to water heater unless you are

sure all of the air is out of the tank and

the tank is completely full of water.

Although this water heater is equipped

with “Dry-Fire” protecon, be certain

all air is purged from the tank before

making any electrical connecons.

Be sure the electrical power

to the water heater is turned

OFF at the circuit breaker

panel (or remove the circuit’s fuses).

Using a non-contact circuit

tester, check the wiring to

make certain the power is OFF

and the circuit is not energized.

This water heater requires a

208/240 VAC single phase 30

amp power supply, at 50Hz or

60Hz. Check the water heater’s data

plate (Figure 24) and ensure that the

home’s voltage, wiring size (ampacity)

and circuit breaker rang and type are

correct for this water heater. Refer to

the wiring diagram located on the

water heater, and on page 38 of this

manual, for the correct electrical

connecons. Ensure that wire sizes,

type, and connecons comply with all

applicable local codes. In the absence

of local codes, follow NFPA-70 and the

current edion of the Naonal Electric

Code (NEC).

1/2” Conduit

Opening

Green

Ground

Screw

Green

Ground

Wire

Red Wire

Black Wire

Power Supply

Connector

Figure 23 - Connecng the electrical wires

(boom cover to electrical juncon box removed

for clarity).

If metal conduit is used for the

grounding conductor:

• The grounding electrode conductor

shall be 10 gauge solid copper wire.

The copper wire shall be of one

connuous length without a splice

or joint.

• Rigid metal conduit, intermediate

metal conduit, or electrical metallic

tubing may be used for the ground-

ing means if conduit or tubing is

terminated in ngs approved for

grounding.

• Flexible metal conduit or exible

metallic tubing shall be permied for

grounding if all the following condi-

ons are met:

I. The length in any ground return

path does not exceed 6 feet/1.8 m.

II. The circuit conductors contained

therein are protected by overcur-

rent devices rated at 30 amperes.

III. The conduit or tubing is terminat-

ed in ngs approved for ground-

ing.

For complete grounding details and

all allowable excepons, refer to the

current edion of the Naonal Electric

Code NFPA-70.

Data Plate

Figure 24 - The water heater’s electrical require-

ments can be determined from the data plate.

Remove the top and boom

covers on the electrical

juncon box on the side of the

water heater.

Install wiring in an approved

conduit (if required by local

codes). Use a UL listed or CSA

approved strain relief to secure the

electrical wiring to the water heater.

Connect the ground wire to

the green ground screw.

Connect the home’s two

power wires to the water heater’s two

power wires. Use suitable wire

connectors or other approved means

to make the power connecons.

Replace the juncon box

covers and secure with the

screws provided.

WARNING! Be sure the cover to

juncon box is secured to reduce the

risk of re and electric shock.

18 • Residenal Electric Water Heater Use and Care Guide

Step: 15

Installing the Leak

Detecon Sensor

The Leak Detecon Sensor (LDS) does

not provide protecon against a water

leak, it only provides nocaon that

water is present in the locaon of the

sensor. When a leak is detected, the

Control Assembly will display an error

code accompanied by a ashing light

and audible signal. If the presence

of water is indicated, disconnect

power to the water heater, turn OFF

the incoming water and address the

source of the leak before returning

the unit to service. See included kit

instrucons found with the LDS for

detailed installaon instrucons.

Plug the LDS into the

connecon port next to the

lower element access panel.

Aach the LDS to the heater

or drain pan using the tape

on the back of the LDS.

Ensure the metal probes point down.

Use the included wire clamps

to organize the wires.

Step: 16

Adjusng the

Temperature

With the installaon steps completed,

you may adjust the water heater’s

temperature seng if desired.

Turn the electric power back

ON. Remove/pull out the

baery protecve tab from

the le side of the Control Assembly.

Set the thermostat to the

desired temperature on the

Control Assembly (see

“Adjusng the Control Assembly’s

Operaonal Modes” on page 21). The

set point on this water heater has

been factory set to approximately

120°F/49°C to reduce the risk of scald

injury. You may wish to set a higher

temperature to provide hot water for

automac dishwashers or laundry

machines, to provide more hot water

capacity, and to reduce bacterial

growth. Higher tank temperatures

(140°F/60°C) kill bacteria that cause a

condion known as “smelly water”

and can reduce the levels of bacteria

that cause water-borne diseases.

WARNING! Higher temperatures

increase the risk of scalding, but even

at 120°F/49°C, hot water can scald

(see page 4 and Figure 25).

If you increase the water heater’s

temperature seng, install

Thermostac Mixing Valve(s) at each

point-of-use to reduce the risk of

scalding.

MIX



Figure 25 - Adjust Thermostac Mixing Valves at

each point-of-use to 120°F/49°C or lower.

Wait for the water to heat up.

It may take several hours for

a tank of cold water to heat

up. If you have no hot water aer two

hours, refer to the “Troubleshoong”

secon (beginning on page 25).

WARNING! If you have increased

the temperature seng and the

Thermostac Mixing Valves are not

set properly (or not installed) you

could scald yourself while checking

the temperature.

Check water temperature at

several points in your home

(for example, the bathtub

faucet, shower, or lavatory sink) and

adjust the Thermostac Mixing Valves

as needed. If you are not sure how to

adjust the Thermostac Mixing Valve

sengs, or are not sure if you have

Thermostac Mixing Valves, contact a

qualied person.

Post Installaon

Review

Understand how to use the

Control Assembly to set the

various modes and funcons.

Hybrid Mode is the

recommended Operang

Mode. Understand the

various Operang Modes and which

mode may be best, based on ambient

temperature and hot water demands.

Understand the importance

of roune inspecon/

maintenance of the

condensate drain pan and line. This is

to prevent any possible drain line

blockage resulng in the condensate

drain pan overowing.

To maintain opmal

operaon, check, remove and

clean the air lter as needed.

The installaon Instrucons

and Use and Care Guide

should be kept with the

water heater for reference.

INSTALLATION

Residenal Electric Water Heater Use and Care Guide • 19

OPERATION

Start-up and Operaon

NOTICE: The default operang mode

is Hybrid Mode. To select a dierent

mode, see “Adjusng the Control

Assembly’s Operaonal Modes” on

page 21.

Turn the electric power ON at

the circuit breaker panel, or

fuse box. Power to the water

heater will allow the water heater to

run a system diagnosc. This typically

takes several minutes.

NOTICE: The water heater will conduct

a system diagnosc (approximately

seven (7) to ten (10) minutes) each

me power is applied from an o

state. Normal operaon will begin

aer the system diagnosc has been

completed. If the system diagnosc

yields any codes, reference the

diagnosc codes secon in this manual

(see pages 25-27).

The diagnosc sequence

typically takes seven (7) to ten

(10) minutes. During this

period the Control Assembly will

display a series of single, alternang

dashes repevely. Once the

diagnosc sequence has nished, the

fan will turn on.

NOTICE: The heat pump’s fan will

not turn on if the average water

temperature in the tank is less than

55°F/13°C and/or the ambient air

temperature is above 120°F/49°C, or

below 37°F/7°C. Should the internal

diagnoscs detect the heat pump is

out of operaonal range, the Control

Assembly will display the code HPO.

Normal operaon will be restored

once heat pump is within operaonal

range.

Set the desired operaonal

mode. For typical installaons,

the factory default mode

(Hybrid Mode) oers the best

combinaon of eciency and hot

water delivery.

Operang Mode

Descripons

The operang modes can be changed

by pressing the buon for any desired

mode (Figure 26 on page 21). The

Operaon Mode Indicaon Light will

turn on when the relevant mode is

selected.

This unit is equipped with technology

that senses the hot water demand

from the unit. While in Heat Pump or

Hybrid Mode, during normal usage,

the unit will operate the heat pump

for maximum eciency. In Hybrid

Mode, during periods when the

water usage is above normal, this unit

has the ability to use one element

(upper or lower) and the heat pump

simultaneously to help improve

recovery. This transion is seamless

and will go unnoced.

General Operaon

IMPORTANT: On the inial start-up

of the unit, the water heater will go

through a seven (7) to ten (10) minute

diagnosc period prior to heang the

water.

NOTICE: If the water is warm/hot, the

unit will not go through the diagnosc

period.

The primary funcon of the Control

Assembly is to heat the water in the

tank unl it reaches the temperature

set point. The water heater has

three means of heang the water:

the elements, the heat pump, and a

combinaon of the elements and heat

pump.

The control logic of the Control

Assembly is designed so that the heat

pump will always have priority over

the elements when within operaonal

range. The temperature regulaon will

not be performed unl aer Dry-Fire

detecon tesng indicates that there is

sucient water in the tank.

Vacaon Mode

To save energy, select Vacaon Mode

to lower the temperature seng on

the thermostat if you plan to be away

for an extended me.

NOTICE: Vacaon Mode has a xed set

point of 50°F/10°C.

When Vacaon Mode is selected, the

vacaon mer will be displayed. The

default vacaon days are preset at 7

days. Press the Up and Down buons

to modify the mer to desired number

of vacaon days (seng range: 1 to

99 days or permanently ON). The

vacaon mer will blink on the display;

press the Enter buon to conrm the

vacaon mer. To deacvate Vacaon

Mode, press the Vacaon Mode buon

to return to the previous operang

mode or press the buon for any other

desired mode.

When the vacaon days decrease to 9

hours remaining, the Control Assembly

will automacally switch to the

previously selected mode.

NOTICE: Normally, the display will only

show the remaining vacaon days.

WARNING! Hydrogen gas builds up

in a hot water system when it is not

used for a long period (two weeks

or more). Hydrogen gas is extremely

ammable. If the hot water system

has not been used for two weeks or

more, open a hot water faucet for

several minutes at the kitchen sink

before using any electrical appliances

connected to the hot water system.

Do not smoke or have an open ame

or other ignion source near the

faucet while it is open.

Heat Pump Mode

Provides the highest eciency and

lowest cost operaon by using only

the heat pump for heang. Recovery

me and eciency will vary with

ambient temperature and relave

OPERATION

20 • Residenal Electric Water Heater Use and Care Guide

OPERATION

humidity. Eciency will be greatest,

and recovery quickest, when both

are high. At lower temperatures and

relave humidity levels, eciency will

be lower and recovery will take longer.

Heat pump operaon is allowed

between 37°F/3°C to 120°F/48.9°C

ambient temperature. At ambient

temperatures lower than 37°F/3°C

and greater than 120°F/48.9°C, the

heat pump will not operate. Similarly,

if the average water temperature

in the tank is less than 55°F/13°C,

the heat pump will not operate. The

Control Assembly will display the

code HPO, and the unit will operate

in Electric Mode unl ambient air and

water temperatures return to the safe

operang range of the heat pump.

Hybrid Mode

This is the default, recommended

seng combining high energy

eciency with reduced recovery

me. This mode uses the heat pump

as the primary heang source. One

of the heang elements (upper or

lower) will provide supplementary

heang if demand exceeds a

predetermined level so that the set

point temperature can be recovered

more quickly.

Electric Mode

The water heater funcons as a

convenonal electric unit, relying on

only the elements for heat. This mode

may be useful in periods of increased

hot water demands. When Electric

Mode is selected, the duraon mer

will be displayed. The default Electric

Mode days are preset at 3 days. Press

the Up and Down buons to modify

the mer to the desired number of

Electric Mode days (seng range: 1

to 7 days). The mer will blink on the

display; press the Mode/Enter buon

to conrm the Electric Mode mer.

NOTICE: Do not shut o power to the

unit for extended periods of me.

If power must be turned o for an

extended period of me, turn OFF

the power to the water heater at the

circuit breaker/fuse box, and then

drain the tank completely.

Hot Water+ Mode

This feature increases the amount

of usable hot water available to

beer match your daily needs. It

stores addional thermal energy by

increasing the temperature of the

water in the tank. As hot water is

drawn from the tank the integrated

smart valve combines with cold

water to mix to the desired water

temperature set on the controls.

By default, this funcon is

deacvated, but can be enabled to

three increasing levels of performance

using the Hot Water+ Mode buon

on the Control Assembly (Figure 26).

This mode operates simultaneously

with Hybrid, Heat Pump, or Electric

Mode. Hot Water+ Mode is opmized

for the factory 120°F/49°C outlet

water temperature seng and will

have decreasing benets as the set

temperature is increased.

When Hot Water+ Mode is acvated,

the LED indicator for the selected

operang mode (Hybrid, Heat Pump,

or Electric Mode) will remain lit.

Guest Mode

This mode maximizes the amount of

hot water available for holidays or

other mes with higher than normal

hot water usage. It stores addional

thermal energy by increasing the

temperature of the water in the tank.

As hot water is drawn from the tank

the integrated smart valve combines

with cold water to mix to the desired

water temperature set on the

controls.

When Guest Mode is selected, the

duraon mer will be displayed. The

default Guest Mode days are preset

at 3 days duraon. Press the Up and

Down buons to modify the mer to

the desired number of Guest Mode

days (seng range: 1 to 7 days). The

mer will blink on the display; press

the Mode/Enter buon to conrm the

Guest Mode mer. The water heater

will revert to the previous operang

mode when the duraon has expired.

NOTICE: Operang the water heater

in Guest Mode may increase energy

consumpon.

Other Controls

HEAT PUMP DEFROSTING

INDICATION:

There will be frost accumulang

on the evaporator when the heat

pump is operated under low ambient

temperatures. The controller will

order the unit to enter defrosng

cycle to opmize the heat pump

operaon performance. During

the defrosng period, the Control

Assembly will display ICE as an

indicaon.

OUT OF HEAT PUMP

OPERATION RANGE:

The Control Assembly will display HPO

as an indicaon that the ambient and/

or water temperature condion is out

of the heat pump operaon range.

NOTICE: The display will go into

“Sleep Mode” for energy saving if

there is no operaon on any buon

for 15 minutes. All of the display and

lights will be turned o except for the

“Operaonal Mode Indicaon Light,”

which will remain illuminated while

the unit is powered on. The unit can

be awakened by pressing any buon.

Your Heat Pump Water Heater is

equipped with an EcoPort CTA-2045

communicaon port. Contact your

local electric ulies company for

parcipaon and plug in module

availability and to learn more

about potenal energy savings

opportunies.

Residenal Electric Water Heater Use and Care Guide • 21

OPERATION

Control Assembly

Lock LED Indicator

Water Temperature

Set Point

Temperature

Down (Decrease)

Button

Temperature

Up (Increase)

Button

Wi-Fi

Button

Grid Enabled

Button W/LED

Indicator

Hot Water+ Mode

Button

Celsius LED

Indicator

Fahrenheit LED

Indicator

Hybrid Mode

Button

Days LED

Indicator

Alert

Indicator

ENTER

Vacation Mode

Button

Guest Mode

Button

LCD Display Panel

Enter/Lock Button

Bluetooth

Button

Electric Mode

Button

Heat Pump Mode

Button

Heating Cycle

LED Indicator

Figure 26 - Control Assembly

ADJUSTING THE CONTROL ASSEMBLY’S

OPERATIONAL MODES

If locked, the operang modes can be changed by holding the

buon for approximately 3 seconds, then touching the

desired mode icon on the Control Assembly (Figure 26).

WATER TEMPERATURE ADJUSTMENT

IMPORTANT: On the inial start-up of the unit, the water

heater will go through a seven (7) to ten (10) minute diagnosc

period prior to heang the water. Before aempng to adjust

the thermostat, read the “Important Safety Informaon”

secon on page 4. If the instrucons are not clear, contact a

qualied service technician.

The water temperature can be adjusted from 95°F/35°C to

150°F/65°C by pressing followed by the

buon

to set the desired temperature. The Control Assembly is

unlocked by default. To lock the display aer seng the

parameters, hold the

buon for 3 seconds.

°F/°C SWITCH: Press and hold the “Temperature Down” buon,

in combinaon with the “Enter” buon, for 3 seconds to switch

temperature unit between Fahrenheit and Celsius.

HYBRID MODE - System default mode. Pressing this

buon will allow high eciency heat pump operaon

with supplementary heang from a backup heang

element during periods of high demand.

HEAT PUMP MODE - Provides the highest eciency

and lowest cost operaon by using only the heat

pump for heang while in the safe ambient operang

range of the heat pump (between 37°F/3°C to

120°F/48.9°C).

VACATION MODE - The Control Assembly adjusts the

temperature set point to approximately 50°F/10°C.

This mode is recommended when the water heater

is not in use for a long period of me. This mode

minimizes energy consumpon and prevents the

water heater from freezing during cold weather.

HOT WATER+ MODE - Operates simultaneously with

Hybrid, Heat Pump or Electric Mode. Allows the user

to enable three levels of increasing performance

while maintaining the temperature set point.

GUEST MODE - Provides maximum performance

and capacity for higher than normal hot water

usage. Selecng this mode may increase energy

consumpon.

ELECTRIC MODE - The water heater funcons as

a convenonal electric unit, relying on only the

elements for heat. This mode may be useful in

periods of increased hot water demand.

SMART GRID CONTROL - Pressing this buon will

enable or disable a request for grid control (see page

24).

CONTROL ASSEMBLY LOCK - Holding this buon for

more than 3 seconds switches the lock mode on or

o.

Wi-Fi - Press this buon once to acvate the Wi-Fi

signal.

BLUETOOTH - Press this buon once to acvate the

Bluetooth signal.

°F/

°F/°C - Press and hold the “Temperature Down”

buon, in combinaon with the “Enter” buon,

for 3 seconds to switch temperature unit between

Fahrenheit and Celsius.

HEATING CYCLE INDICATOR - Indicates the water

heater is in a heang cycle and either the elements

are energized or the heat pump is operang.

DAYS - Indicates the number of days (1 to 99+) the

unit will be set in vacaon mode.

ALERT INDICATOR - Indicates when there is a

Warning/Fault.

FAULT CONDITION - Will display a three digit fault

code with Alert Icon Flashing (see Diagnosc code

chart on page 25).

LOCK - Indicates the control assembly is locked.

22 • Residenal Electric Water Heater Use and Care Guide

Wi-Fi

(Control Assembly)

This water heater comes equipped

with the iCOMM™ remote monitoring

system. It allows users to monitor

crical operaons and diagnose issues

remotely using the manufacturer’s

water heater app (available for IOS

and Android).

The iCOMM system can automacally

nofy selected personnel via email

and/or cellular phone text messages if

operaonal problems occur.

It is recommended the water heater

app be installed on the homeowner’s

device prior to seng up the Wi-Fi

funcon on this water heater.

IMPORTANT: By enabling and

connecng your water heater to

Wi-Fi, you are granng permission

to the manufacturer to push “over-

the-air” (OTA) updates to the water

heater and to collect telemetry data

regarding the water heater. The OTA

updates may be pushed periodically

to address bugs and provide security

patches. Refer to the Terms and

Condions at www.aosmith.com/

Ulity-Pages/Terms-and-Condions/

for more details. Also, refer to www.

aosmith.com/Privacy-Policy/ for

more informaon about how we

collect and use data.

Wi-Fi Set Up:

The Wi-Fi signal is set to o by default

and will not produce a signal unl

acvated.

NOTICE: Have the router SSID and

password ready.

• Download the iCOMM Ulies app

for your smart phone.

• Launch the iCOMM Ulies app on

your smart phone, then follow the

simple steps. The iCOMM Ulies

app makes it easy to set up, program

and control your water heater.

• Create an account or log in to your

exisng account and tap the “add a

water heater” buon.

• When the app prompts you to ac-

vate the Wi-Fi signal, proceed with

the following steps:

To acvate the Wi-Fi signal,

press the Wi-Fi buon once.

The LED will blink on and o

in 1/2 second intervals. Wi-Fi will

acvate pairing mode (Figure 27).

ENTER

Pressing the Wi-Fi button once will activate

the Wi-Fi signal for 15 minutes.

Figure 27 - Wi-Fi Control

The app will display a

temporary Wi-Fi network to

connect to your device.

Select the network that matches the

water heater DSN value, and your

device will connect to the Wi- radio

on the Control Assembly:

Figure 28 - Select Temporary Network

The app will begin the

communicaon process of

linking your water heater to

your Wi-Fi router.

Select your preferred Wi-Fi

network from the list on the

app. LED will pulse from dim

to bright when aempng to connect

to local network.

Figure 29 - Select Your Wi-Fi Network

NOTICE: If the app does not prompt

you with a list of available Wi-Fi

networks, access Wi-Fi sengs on

your device and select your preferred

network.

The app will aempt to

connect with your Wi-Fi

network. We recommend

connecng to a Wi-Fi network that

has been secured with a password.

The LED will hold solid when

connected.

The app will display the water

heater temperature set point.

Congure the water heater

Set Point, Mode, and Time of

Use Rate Plan if applicable.

NOTICE: If the Wi-Fi signal is to be

terminated, press and hold the Wi-Fi

buon for 3 seconds. The Control

Assembly will beep once. This will

turn the Wi-Fi signal o. The Control

Assembly resets and the LED display

will turn o. Press and hold the Wi-Fi

buon for 9 seconds to remove the

original connected network from the

Control Assembly memory.

OPERATION

Residenal Electric Water Heater Use and Care Guide • 23

OPERATION

Bluetooth

(Control Assembly)

This water heater comes equipped

with the iCOMM™ remote monitoring

system. It allows users to monitor

crical operaons and diagnose issues

remotely using the manufacturer’s

water heater app (available for IOS and

Android).

The iCOMM system can automacally

nofy selected personnel via email

and/or cellular phone text messages if

operaonal problems occur.

It is recommended the water heater

app be installed on the homeowner’s

device prior to seng up the

Bluetooth funcon on this water

heater.

IMPORTANT: By enabling and

connecng your water heater to

Bluetooth, you are granng permission

to the manufacturer to push “over-

the-air” (OTA) updates to the water

heater and to collect telemetry data

regarding the water heater. The OTA

updates may be pushed periodically

to address bugs and provide security

patches. Refer to the Terms and

Condions at www.aosmith.com/

Ulity-Pages/Terms-and-Condions/

for more details. Also, refer to www.

aosmith.com/Privacy-Policy/ for more

informaon about how we collect and

use data.

Bluetooth Set Up:

The Bluetooth signal is set to o by

default and will not produce a signal

unl acvated.

NOTICE: Have the device SSID and

password ready.

• Download the iCOMM Ulies app

for your smart phone.

• Launch the iCOMM Ulies app on

your smart phone, then follow the

simple steps. The iCOMM Ulies

app makes it easy to set up, program

and control your water heater.

• Create an account or log in to your

exisng account and tap the “add a

water heater” buon.

• When the app prompts you to ac-

vate the Bluetooth signal, proceed

with the following steps:

To acvate the Bluetooth

signal, press the Bluetooth

buon once. The LED will

blink on and o in 1/2 second

intervals. Bluetooth will acvate

pairing mode (Figure 30).

Pressing the Bluetooth button once will activate

the Bluetooth signal for 10 minutes.

ENTER

Figure 30 - Bluetooth Control

NOTICE: Once acvated, the Bluetooth

signal will automacally terminate

aer 10 minutes if no aempt to pair

your device is made.

Select the opon in the app to

begin linking your device with

the Bluetooth radio on the

Control Assembly.

The app will begin the

communicaon process of

linking your water heater to

your Bluetooth device.

The app will aempt to

connect with your Bluetooth

device. We recommend

connecng to a Bluetooth device that

has been secured with a password.

The LED will hold solid when

connected.

NOTICE: Once connected, the

Bluetooth signal will automacally

terminate aer 30 minutes of

inacvity.

The app will display the water

heater temperature set point.

Congure the water heater

Set Point, Mode, and Time of

Use Rate Plan if applicable.

NOTICE: If the Bluetooth signal is to

be terminated, press and hold the

Bluetooth buon for 3 seconds. The

Control Assembly will beep once.

This will turn the Bluetooth signal o.

The Control Assembly resets and the

LED display will turn o. The original

connected device has been removed

from the memory of the water heater

Control Assembly.

OPERATION

24 • Residenal Electric Water Heater Use and Care Guide

Smart Grid Technology

The electric Smart Grid will enable

signicant improvements in electric

power reliability and quality through

reducon of peak power demand,

while providing consumers the

knowledge and ability to manage

their energy consumpon and ulity

costs. According to the Department

of Energy (DOE), since 1982 the

growth in peak electricity demand

has exceeded power transmission

growth. This has caused more

frequent blackouts and service

interrupons, as well as an increase in

the costly reserve capacity the power

grid requires to meet higher peak

demands. The increased demand for

electrical power across the naon has

also led to higher peak ulity costs.

Smart appliances are one way to

help migate this problem. By using

advanced digital communicaon

technologies, smart appliances will

be able to communicate with local

power companies or home energy

systems, and react accordingly to

save energy and money. For example,

during peak demand periods, the

water heater may pause or delay its

power consumpon and thus reduce

the load on the smart ulity grid.

Addionally, smart appliances will

also communicate with consumers to

let them know how much energy they

are consuming. This will eventually

allow consumers to control their

appliances, manage energy usage, and

ulmately save money.

EcoPort CTA-2045,

Smart Grid Control

(Where Available)

Where available, grid communicaon

adaptors called Universal

Communicaon Modules (UCM)

may be supplied by the local power

company or purchased from leading

retailers. A UCM is a direct digital

thermostat that provides integrated

control of the unit’s thermostat.

Please contact your local power

company for more informaon.

WARNING! Electrical Shock Hazard.

Disconnect power before servicing.

Replace all parts and panels before

operang. Failure to do so can result

in death or electrical shock.

To acvate Smart Grid Control, turn

OFF electric power to the water

heater at the circuit breaker or fuse

box. Using a non-contact circuit

tester, check the power wires to make

certain the power is OFF. Remove

the cover over the grid connecon

pins and plug in the UCM grid

communicaon adaptor and return

power to the water heater at the

circuit breaker or fuse box (Figure 31).

Remove

Panel

Grid Connection Pins

ENTER

Figure 31 - Accessing EcoPort CTA-2045 commu-

nicaon port.

NOTICE: Use only approved grid

communicaon adaptors. This

will enable the power company to

communicate the peak demand

periods for the water heater’s power

usage.

Aer this connecon is made, the grid

control is automacally enabled. Press

the “Enter” buon to conrm UCM is

present. This acon will be followed

by a solid LED from the grid indicator

(Figure 32).

Enabling this feature will allow

acceptance of the power company

communicaon grid management

requests.

NOTICE: The LED will blink when the

power company has control of the

unit.

Pressing the Smart Grid Control

button will enable and/or disable

a request for grid control.

ENTER

Figure 32 - Smart Grid Control Buon

To disable (override) grid control,

press the “Smart Grid Control”

buon (Figure 32). This acon will be

followed by a 72 hour mer. Remove

CTA 2045 UCM. Press the “Enter”

buon to conrm the disconnecon.

The LED will turn o.

NOTICE: If the CTA 2045 UCM is

not removed followed by pressing

the “Enter” buon, the grid will be

enabled automacally once the 72

hour mer has expired.

OPERATION

Residenal Electric Water Heater Use and Care Guide • 25

TROUBLESHOOTING

CONTROL ASSEMBLY DIAGNOSTIC

CODE CHART

IMPORTANT: Before aempng to adjust the thermostat, read

the “Important Safety Informaon” secon on page 4. If the

instrucons are not clear, contact a qualied person.

ENTER

Error

Code

Battery

Tray

Figure 33 - Control Assembly Diagnosc Coding.

ERROR CODE INDICATES CORRECTIVE ACTION*

No Error Code

Displayed

Not Enough Hot Water

High usage, plumbing leak, operating mode

adjustment

1. Check for plumbing leak.

2. Adjust temperature; see scald warnings on heater and in

manual.

3. Contact a qualied person to perform a volume test.

No Error Code

Displayed

Water Too Hot

Water temperature set too high or grounded element 1. Reduce temperature setting; or

2. Turn OFF electrical power at the breaker.

3. Check element circuits for resistance of 5-25 ohms (replace if

required, see page 34).

4. Turn ON electrical power at breaker.

5. If the error persists, contact a qualied person.

No Error Code

Displayed

No Hot Water

No power, control panel or thermostat operation 1. Turn OFF electrical power at breaker.

2. Unplug and reconnect 24 pin connector.

3. Turn ON electrical power at breaker.

4. Contact a qualied person to verify correct voltage to unit.

NOTICE: If the control panel was not connected via Wi-Fi or

Bluetooth, the time will need to be set.

001 with alert indicator ashing

(also ashing red LED and beeper)

Dry-re, electrical power on with the tank not

completely full of water

1. Turn OFF electrical power at breaker. Add water, open a hot

water faucet to bleed all air until water ows without air bursts.

2. Turn ON electrical power at breaker.

3. See “Important Safety Information” on page 4.

003 with alert indicator ashing

(also ashing red LED)

Upper thermistor sensor failure. Upper thermistor

sensor is mounted to tank and located above upper

element.

NOTICE: The Control Assembly will go into Limp

Mode 1 until the failure is corrected. See page 28.

1. Turn OFF electrical power at the breaker.

2. Check electrical connections at Control Assembly board.

3. If there are no issues with the wiring, replace the thermistor.

4. Turn ON electrical power at breaker.

004 with alert indicator ashing

(also ashing red LED)

Lower thermistor sensor failure. Lower thermistor

sensor is mounted to tank and located above lower

element.

NOTICE: The Control Assembly will go into Limp

Mode 2 until the failure is corrected. See page 28.

1. Turn OFF electrical power at the breaker.

2. Check electrical connections at Control Assembly board.

3. If there are no issues with the wiring, replace the thermistor.

4. Turn ON electrical power at breaker.

006 with alert indicator ashing

(also ashing red LED and beeper)

Internal Processor Error

- Frequency Fault

- Standard AD Reference Fault

- Non-Volatile Memory Fault

- Crystal Fault

1. Turn OFF electrical power at the breaker. Now turn ON electrical

power to see if error clears. If error has not cleared, turn OFF

electrical power at the breaker and replace Control Assembly.

2. Turn ON electrical power at breaker.

009 with alert indicator ashing

(also ashing red LED)

Power supply voltage is too low

NOTICE: The Control Assembly will go into Limp

Mode 3 until the failure is corrected. See page 28.

Check for loose electrical connections, refer to “Power Cycling the

Unit” on page 31.

TROUBLESHOOTING

26 • Residenal Electric Water Heater Use and Care Guide

ERROR CODE INDICATES CORRECTIVE ACTION*

021 with alert indicator ashing

(also ashing red LED)

Upper element circuit failure. Lower element is still

operable

NOTICE: The Control Assembly will go into Limp

Mode 1 until the failure is corrected. See page 28.

1. Turn OFF electrical power at the breaker.

2. Check element circuits for resistance of 5-25 ohms (replace if

required, see page 34).

3. Check wires at elements, thermostat and Control Assembly

board for damage.

4. Turn ON electrical power at breaker.

5. If the error persists, contact a qualied person.

022 with alert indicator ashing

(also ashing red LED)

Lower element circuit failure. Upper element is still

operable

NOTICE: The Control Assembly will go into Limp

Mode 2 until the failure is corrected. See page 28.

1. Turn OFF electrical power at the breaker.

2. Check element circuits for resistance of 5-25 ohms (replace if

required, see page 34).

3. Check wires at elements, thermostat and Control Assembly

board for damage.

4. Turn ON electrical power at breaker.

5. If the error persists, contact a qualied person.

025 with alert indicator ashing

(also ashing red LED)

Heat Pump Coil Temperature Sensor is not functioning

NOTICE: The Control Assembly will go into Limp

Mode 3 until the failure is corrected. See page 28.

1. Power OFF (“Power Cycling the Unit,” page 31).

2. Disconnect and reconnect the J9 connection from control board.

3. Inspect wire for damage.

4. Re-install Control Assembly.

5. Reconnect power to water heater.

6. If error persists, replace temperature sensor.

026 with alert indicator ashing

(also ashing red LED)

Heat Pump Suction Temperature Sensor is not

functioning

NOTICE: The Control Assembly will go into Limp

Mode 3 until the failure is corrected. See page 28.

1. Power OFF (“Power Cycling the Unit,” page 31).

2. Disconnect and reconnect the J9 connection from control board.

3. Inspect wire for damage.

4. Re-install Control Assembly.

5. Reconnect power to water heater.

6. If error persists, replace temperature sensor.

027 with alert indicator ashing

(also ashing red LED)

Heat Pump Discharge Temperature Sensor is not

functioning

NOTICE: The Control Assembly will go into Limp

Mode 3 until the failure is corrected. See page 28.

1. Power OFF (“Power Cycling the Unit,” page 31).

2. Disconnect and reconnect the J9 connection from control board.

3. Inspect wire for damage.

4. Re-install Control Assembly.

5. Reconnect power to water heater.

6. If error persists, replace temperature sensor.

028 with alert indicator ashing

(also ashing red LED and beeper)

Ambient Temperature Sensor failure (Heat Pump

Compressor is outside of operational temperature

range)

NOTICE: The Control Assembly will go into Limp

Mode 3 until the failure is corrected. See page 28.

1. Power OFF (“Power Cycling the Unit,” page 31).

2. Disconnect and reconnect the J9 connection from control board.

3. Inspect wire for damage.

4. Re-install Control Assembly.

5. Reconnect power to water heater.

6. If error persists, replace temperature sensor.

029 with alert indicator ashing

(also ashing red LED and beeper)

Outlet temperature sensor failure

NOTICE: Guest Mode and Hot Water+ Mode will be

unavailable until the failure is corrected.

1. Power OFF (“Power Cycling the Unit,” page 31).

2. Disconnect and reconnect the J3 connection from control board.

3. Inspect wires for damage.

4. Re-install Control Assembly.

5. Reconnect power to water heater.

6. If error persists, replace outlet temperature sensor.

031 with alert indicator ashing

(also ashing red LED and beeper)

Water Leak 1. Turn OFF electrical power at the breaker, check all electrical

connections, and wiring for damage.

2. Check for plumbing leaks and correct accordingly.

3. If tank is leaking, replace the unit.

4. Turn ON electrical power at breaker.

044 with alert indicator ashing

(also ashing red LED)

SAC anode depleted 1. Turn OFF electrical power. Shut OFF the cold water valve at the

main line and open a hot water faucet to release pressure from

the water heater.

2. Remove anode rod (see page 33).

3. Inspect anode rod and replace if necessary.

046 with alert indicator ashing

(also ashing red LED and beeper)

Shut-o󰀨 Valve (if applicable) 1. Turn OFF electrical power. Shut OFF the cold water valve at the

main line and open a hot water faucet to release pressure from

the water heater.

2. Check the shut-o󰀨 valve, making sure the valve is not stuck

in the open or closed position (see instructions provided with

shut-o󰀨 valve).

3. Replace the shut-o󰀨 valve, if needed.

4. Turn ON electrical power at breaker.

5. Open the cold water valve to ll the heater with water, open

a hot water faucet to bleed all air until water ows without air

bursts.

TROUBLESHOOTING

Residenal Electric Water Heater Use and Care Guide • 27

TROUBLESHOOTING

ERROR CODE INDICATES CORRECTIVE ACTION*

047 with alert indicator ashing

(also ashing red LED)

Smart Valve failure

NOTICE: Guest Mode and Hot Water+ Mode will be

unavailable until the failure is corrected.

1. Power OFF (“Power Cycling the Unit,” page 31).

2. Reconnect power to water heater. If error persists, replace

Smart Valve.

048 with alert indicator ashing

(also ashing red LED)

Battery Low Energy 1. Make sure the battery protective tab has been properly removed

from the battery tray, located on the left side of the Control

Assembly.

2. Locate the battery tray on the side of the Control Assembly.

3. Remove the Phillips head screw, slide the battery tray out from

the Control Assembly.

4. Remove the old battery and replace with Panasonic® BR2032

or Murata CR2032 battery only. Use of another battery may

present a risk of re or explosion.

5. Reinstall the tray with new battery into the Control Assembly.

Hand tighten the Phillips head screw to secure the tray in the

Control Assembly.

NOTICE: If the Control Assembly was not connected via Wi-Fi,

Bluetooth, or powered by a power source, the time will need to be

set.

080 with alert indicator ashing

(also ashing red LED)

Air lter is dirty 1. Take the tab on the air lter and remove (slide) it from the air

intake duct adaptor located on the top of the unit.

2. If you are replacing the lter, skip to step three. To clean the

lter, use a vacuum with a hose attachment to remove any dust

or debris.

3. Place the new or cleaned lter into the water heater.

081 with alert indicator ashing

(also ashing red LED and beeper)

Condensate management

NOTICE: The Control Assembly will go into Limp

Mode 3 until the failure is corrected. See page 28.

1. Ensure unit is installed level.

2. Check for blocked condensate drain line, clear drain line as

necessary.

3. If an accessory condensate pump was installed: Turn OFF

power to the water heater at the breaker and check control

wire connections to condensate pump. See “Connecting the

Condensate Pump Optional Overow Shut-O󰀨 Switch” on page

11. Reconnect power to water heater.

4. Check to see if the accessory condensate pump is plugged in

and has power.

5. Ensure the pump is operating properly, check pump outlet tube

for blockage.

6. Repair or replace accessory condensate pump as necessary.

7. If problem persists, call our Technical Assistance Hotline which

is listed on the water heater’s warranty sheet.

083 with alert indicator ashing

(also ashing red LED and beeper**)

Heat Pump Compressor suction pressure is too low

NOTICE: The Control Assembly will go into Limp

Mode 3 until the failure is corrected. See page 28.

Call our Technical Assistance Hotline which is listed on the water

heater’s warranty sheet for further assistance.

084 with alert indicator ashing

(also ashing red LED and beeper**)

Heat Pump Compressor is not functioning

NOTICE: The Control Assembly will go into Limp

Mode 3 until the failure is corrected. See page 28.

Call our Technical Assistance Hotline which is listed on the water

heater’s warranty sheet for further assistance.

085 with alert indicator ashing

(also ashing red LED and beeper**)

Heat Pump Compressor discharge temperature is too

high

NOTICE: The Control Assembly will go into Limp

Mode 3 until the failure is corrected. See page 28.

Call our Technical Assistance Hotline which is listed on the water

heater’s warranty sheet for further assistance.

086 with alert indicator ashing

(also ashing red LED and beeper***)

Fan speed feedback

NOTICE: The Control Assembly will go into Limp

Mode 3 until the failure is corrected. See page 28.

Call our Technical Assistance Hotline which is listed on the water

heater’s warranty sheet for further assistance.

*These instrucons are brief and intended as guidance for a qualied person. If you lack the necessary skills to perform these procedures call the Technical

Assistance Hotline which is listed on the water heater’s warranty sheet for assistance.

**Audible alarm will beep if error code is triggered three (3) mes in one (1) hour.

***Audible alarm will beep if error code is triggered three (3) mes in seventy-two (72) hours.

TROUBLESHOOTING

28 • Residenal Electric Water Heater Use and Care Guide

TROUBLESHOOTING

WARNING! Working near an

energized circuit can result in severe

injury or death from electrical shock.

WARNING! When you are nished,

be sure all covers are secured to

reduce the risk of re and electric

shock.

Troubleshoong &

Maintenance

If you are not qualied or are not

comfortable performing any of

the troubleshoong, repair or

maintenance procedures that follow,

call our Technical Assistance Hotline

for further assistance, or contact a

qualied person.

Limp Mode

The heater will connue operang

with one failed heang method by

switching into Limp Mode:

• (Limp Mode 1): If the control assem-

bly determines that the upper ele-

ment or upper thermistor has failed,

the upper element call for heat will

be sased by the lower element.

• (Limp Mode 2): If the control assem-

bly determines that the lower ele-

ment or lower thermistor has failed,

the lower element call for heat will

be sased by the upper element.

• (Limp Mode 3): If the control assem-

bly determines that the heat pump

is unavailable, both the upper and

lower elements will sasfy the call

for heat.

NOTICE: The Control Assembly will

operate in Limp Mode unl the failure

is corrected.

No Hot Water

The most likely reasons for an electric

water heater to produce NO hot

water are:

• No power to the water heater (no

lights on the unit are acvated).

• Unit in Vacaon Mode.

• ECO tripped.

• Hot water usage paern exceeds

the capability of the water heater in

current mode.

• Non-funconing upper temperature

sensor.

• Faulty thermostac mixing valve.

• Leak in plumbing system.

Follow these steps to diagnose and

correct common electrical problems:

Check the Electrical Power to

the Water Heater.

No hot water is oen caused by a

problem with the home’s electrical

wiring or circuit breakers. You will

need a non-contact circuit tester.

Follow these guidelines:

• Locate the water heater’s circuit

breaker and turn it OFF (or remove

the circuit’s disconnects).

• Locate the electrical juncon box

on the side of the water heater and

remove the cover.

• Idenfy the two power wires. The

power wires are usually black/black

or black/red. The green or copper

wire is the ground wire.

OFF

Figure 34 - Use a non-contact circuit tester to

check for electrical power.

• Turn the circuit breaker back ON (or

install the disconnects) and check

the power on both incoming power

wires using a non-contact circuit

tester.

• Turn the power OFF and replace the

cover on the electrical juncon box.

If the water heater is not geng

power, contact a qualied person to

have your home’s wiring or circuit

breakers checked.

Check the Upper Heang

Element.

If the water heater is geng electrical

power, check to see if the upper

heang element is burned out. If the

upper element is burned out, you will

have no hot water. To check the upper

element, you will need a mulmeter

capable of reading resistance.

• Turn the power OFF at the circuit

breaker or remove disconnects.

• Remove the upper access panel.

• Move the insulaon to access the

ECO and heang element.

Check the Top Two Screws of

the ECO Using a Non-Contact

Circuit Tester and Conrm

that Power is OFF (screw terminals 1

and 3 shown in Figure 36).

With the electrical power OFF,

remove the two power wires from the

upper heang element.

Wires are

removed

Figure 35 - Use a mulmeter to check the resis-

tance of the upper heang element.

Residenal Electric Water Heater Use and Care Guide • 29

TROUBLESHOOTING

Check the Resistance of the

Upper Heang Element Using

a Mulmeter.

Measure the resistance between the

two screw terminals on the upper

heang element. A good element will

have a resistance ranging between 5

and 25 Ohms. If the resistance is:

Outside this Range. Replace the

element (see “Replacing the Heang

Element” on page 34). If the lower

element is a concern, repeat the

element check procedure for the

lower element. The upper and lower

elements should have the same

resistance range.

Within this Range. Reaach the power

wires, making sure the wires are in

good condion and the connecons

are clean and ght.

Check/Reset Energy Cut O (ECO)

Buon.

Terminal 1

Terminal 3

ECO Reset

Button

Figure 36 - Energy Cut O (ECO) Buon.

The Energy Cut O (ECO) shuts o

power to the water heater’s elements

if the temperature of the water in

the tank gets too hot. If the ECO has

tripped, you will have no hot water.

A tripped ECO can usually be reset,

but you should have a qualied

person invesgate the cause of the

overheang and repair the problem.

Do not turn the power back on unl

the cause of the overheang has been

idened and repaired.

To Check the Energy Cut O (ECO):

• Turn OFF the power to the water

heater.

WARNING! Working near an

energized circuit can result in severe

injury or death from electrical shock.

Check power wires in the electrical

juncon box with a non-contact

circuit tester to make sure power is

OFF.

• Press the red ECO reset buon (Fig-

ure 36).

• The ECO was tripped if you hear a

click when it is reset. In most cases,

a tripped ECO indicates that the tank

overheated due to a problem with

one of the elements. Have a qualied

person check the upper and lower

elements and replace if necessary.

• The ECO was not tripped if you did

not hear a click. In that case it should

be checked by a qualied person.

• Replace the insulaon and the upper

access panel.

• Turn the power back ON to the water

heater.

WARNING! Be sure all covers are

secured to reduce the risk of re and

electric shock.

Drips from T&P Relief

Valve Discharge Pipe

A small amount of water dripping from

the Temperature and Pressure (T&P)

Relief Valve usually means the home’s

water pressure is too high or you

need a properly sized and pressurized

Thermal Expansion Tank (see “Step

1” on page 7 for more informaon).

A large amount of hot water coming

from the T&P discharge pipe may be

due to the tank overheang.

WARNING! Do not cap or plug the

T&P Relief Valve or discharge pipe,

and do not operate the water heater

without a funconing T&P Relief

Valve - this could cause an explosion.

Water Pressure too High. High

water pressure can cause the T&P

Relief Valve to drip. Install a Pressure

Reducing Valve (PRV) on the main cold

water supply line. Adjust the PRV to

between 50-60 psi/345-414 kPa.

Thermal Expansion Tank. Install a

Thermal Expansion Tank. If a Thermal

Expansion Tank is already installed

and the T&P Relief Valve discharge

pipe drips, the Thermal Expansion

Tank may be pressurized to the wrong

pressure or the internal bladder may

be defecve. Refer to the instrucons

that came with the Thermal Expansion

Tank for more informaon.

Debris. In rare cases, debris can sck

inside the T&P Relief Valve prevenng

the valve from seang fully. In that

case, the T&P Relief Valve discharge

pipe will drip. You may be able to clear

debris from the T&P Relief Valve by

manually operang the valve, allowing

small quanes of water to ush out

the debris. See the label on the T&P

Relief Valve for instrucons.

WARNING! When manually

operang the T&P Relief Valve,

make sure that no one is in front

of or around the discharge outlet.

The water may be extremely hot

and could cause severe burns. Also,

ensure that the water discharge will

not cause property damage.

If the water pressure is between 50-60

psi/345-414 kPa, a Thermal Expansion

Tank is installed and properly

pressurized, the valve has been cleared

of any debris, and it sll drips, the

valve may be broken – have a qualied

person replace the T&P Relief Valve.

30 • Residenal Electric Water Heater Use and Care Guide

TROUBLESHOOTING

Water Odor

Harmless bacteria normally present

in tap water can mulply in water

heaters and give o a “roen egg”

smell. A higher tank temperature

seng of 140°F/60°C kills the bacteria

that causes “smelly water” and can

reduce the levels of bacteria that

cause water-borne disease. A properly

adjusted Thermostac Mixing Valve

should be installed at each point of

use.

NOTICE: To protect the tank, an anode

rod must be installed in the water

heater at all mes or the warranty is

void.

WARNING! Because higher

temperatures increase the risk of

scalding, if the temperature set

point is higher than 120°F/49°C,

Thermostac Mixing Valves are

parcularly important (see page 4

and Figure 8).

Water Heater Sounds

During the normal operaon of the

water heater, sounds or noises may be

heard. These noises are common and

may result from the following:

• Normal expansion and contracon

of metal parts during periods of

heat-up and cool-down.

• Sediment buildup on or around

the elements could create varying

amounts of noise and may cause

premature tank failure. Drain and

ush the tank as directed (see

“Draining and Flushing the Water

Heater” on page 32).

• The heat pump compressor or fan

running.

Temperature Too High

If the water temperature is too hot:

• Adjust the Control Assembly on

the water heater (see “Adjusng

the Control Assembly’s Operaonal

Modes” on page 21).

• Install or adjust a Thermostac

Mixing Valve (see manufacturer’s

instrucons).

A non-funconing thermostat or

a shorted heang element can

cause extremely hot water. If the

Temperature and Pressure (T&P)

Relief Valve releases large amounts

of very hot water, it is likely due to a

shortened heang element, or more

rarely a non-funconing thermostat,

or the thermostat does not t

snuggly against the tank. Very high

water temperatures can also cause

the Energy Cut O (ECO) to trip (see

“Replacing the ECO” on page 35).

Turn power OFF unl this problem is

repaired.

Low Water Pressure

Check both the cold and hot water

at a sink to determine if the lower

pressure is only on the hot water side.

If both hot and cold faucets have low

pressure, call your local water ulity.

If the low pressure is only on the hot

water side, the primary causes of this

are:

• Melted PEX liner. Soldering copper

pipes while they are connected

to the water heater can melt the

PEX liner inside of the hot and cold

water connecons. Melng the PEX

liner can restrict the ow of hot

and cold water. If that is the case,

replace the nipples at the hot and

cold water connecons.

• Parally closed supply valve. Open

the water heater’s supply valve fully.

Insucient or No Hot

Water, or Slow Hot

Water Recovery

WARNING! Because higher

temperatures increase the risk of

scalding, if the temperature set

point is higher than 120°F/49°C,

Thermostac Mixing Valves are

parcularly important (see page 4

and Figure 8).

If the hot water is simply not warm

enough, there are several possible

causes:

• Thermostac Mixing Valve faulty or

set too low.

• Temperature set point too low.

• Hot water usage paern exceeds

the capability of the water heater in

current mode (see “Operang Mode

Descripons” on page 19).

• Water connecons to unit are

reversed (disconnect and re-install

correctly).

• Leak in plumbing system (check

home for any leaks and repair).

• Lower heang element not func-

oning properly.

• No power to the water heater (no

lights on the unit are on and display

is blank).

• Unit is in Vacaon Mode.

• ECO tripped.

• Non-funconing upper thermistor

sensor (refer to code 003 in the “Di-

agnosc Codes” secon on page 25).

• Air lter is dirty (see “Air Filter Main-

tenance” on page 37).

Residenal Electric Water Heater Use and Care Guide • 31

TROUBLESHOOTING

Thermostac Mixing Valves. If the

hot water is simply not warm enough,

make sure the faucet you are checking

does not have a defecve Thermostac

Mixing Valve. If these devices fail,

they can reduce the amount of hot

water the shower or faucet delivers

even though there is plenty of hot

water in the tank. Always check the

water temperature at several faucets

to make sure the problem is not in a

faucet or shower control.

Temperature Set Point Too Low. If the

water temperature at several faucets

is too cool, adjust the set point at

the Control Assembly (see “Water

Temperature Adjustment” on page 21).

Undersized Water Heater. If your

water heater runs out of hot water

too quickly, it may be too small for

your needs. If the water heater is old,

consider replacing it with a larger

model. If the water heater is in good

condion, you may be able to meet

your family’s hot water needs with

the exisng water heater by installing

a Thermostac Mixing Valve and then

seng the temperature to a higher

set point on the Control Assembly (see

“Water Temperature Adjustment” on

page 21).

You can also reduce your home’s hot

water needs by washing clothes in cold

water, installing ow restrictors on

shower heads, repairing leaky faucets,

and taking other conservave steps.

Reversed Connecons. Check the

hot and cold connecons and make

sure your home’s hot water pipe is

connected to the hot water outlet on

the water heater. Usually, reversed

connecons are found soon aer the

installaon of a new unit.

Plumbing Leak. Even a small leak

in the hot water side of the home’s

plumbing system can make it appear

that the water heater is producing

lile or no hot water. Locate and repair

the leak.

Lower Heang Element Not Working.

If the lower heang element is not

working, you will have some hot water

but not as much as before. Because

the lower element does most of the

work, it usually wears out before the

upper element. Replace the lower

element if necessary (see “Replacing

the Heang Element” on page 34).

Power Cycling the Unit

Find and turn OFF the water

heater’s circuit breaker or

remove disconnects.

Locate the electrical juncon

box on side of water heater,

remove cover and idenfy the

two (2) power wires.

Turn the circuit breaker back

ON (or reinstall the

disconnects) and check for

power on both incoming power wires

using a mulmeter.

Again, turn OFF the water

heater’s circuit breaker, or

remove the disconnects and

replace the electrical juncon box

cover, before performing maintenance

work.

NOTICE: When powered on, the unit

will start to run a system diagnosc.

The diagnosc sequence typically takes

seven (7) to ten (10) minutes. During

this period the Control Assembly will

display a series of single, alternang

dashes repevely.

WARNING! Working near an

energized circuit can result in severe

injury or death from electrical shock.

WARNING! When you are nished,

be sure all covers are secured to

reduce the risk of re and electric

shock.

32 • Residenal Electric Water Heater Use and Care Guide

MAINTENANCE

Roune Maintenance

Roune maintenance will help your

water heater last longer and work

beer. If you cannot perform these

roune maintenance tasks yourself,

contact a qualied person.

IMPORTANT! Failure to perform

required or recommended

maintenance as described in the

following secons may void the

warranty.

Water Heater

Maintenance

Aer the rst six months, drain and

ush the water heater and inspect

the anode rod. Depending on the

hardness of your water, repeat this

process at least annually, or more

frequently if needed. From me

to me you may need to replace a

heang element or a thermostat.

All three maintenance tasks are

described below.

Draining and Flushing

the Water Heater

Tap water contains minerals that

can form lime deposits on heang

elements or sediment in the boom

of the tank. The amount of lime

deposits or sediment depends on the

hardness of your tap water. The rate

at which sediment builds up depends

on water quality and hardness in

your area, the temperature sengs,

and other variables. We recommend

draining and ushing the water heater

aer the rst six months of operaon

to determine the amount of sediment

buildup. Draining sediment extends

the life of the tank, heang elements,

and drain valves.

IMPORTANT! Failure to drain and

ush the water heater of sediment

can deteriorate the tank, heang

elements, and drain valve and cause

leaks resulng in property damage.

• In areas with very hard water,

remove and check the heang ele-

ments whenever you drain the tank.

If you have heavy lime deposits on

heang elements, you will need to

replace them more oen.

• Sediment may form large masses

that can prevent the tank from

draining. Have a qualied person

use a deliming agent suitable for po-

table water to remove the sediment

buildup.

• In most cases, it is easier and less

expensive to replace lime-encrust-

ed elements than trying to remove

heavy lime deposits.

To Drain and Flush the

Tank

Locate the water heater’s

circuit breaker and turn it

OFF (or remove the circuit’s

fuses).

WATER

HEATER

MICRO-

WAVE

LIVING

ROOM

RANGE

STOVE

20 20

2015

FRIDGE

PLUG

DISH

WASHER

HALL

LIGHTS

LAUNDRY

ROOM

TYPE HOM

SERIES 1

10 kA

120/240 V-

TYPE HOM

SERIES 1

10 kA

120/240 V-

TYPE HOM

SERIES 1

10 kA

120/240 V-

YPE HOM

SERIES 1

10 kA

120/240 V-

TYPE HOM

SERIES 1

10 kA

120/240 V-

TYPE HOM

SERIES 1

10 kA

120/240 V-

TYPE HOM

SERIES 1

10 kA

120/240 V-

TYPE HOM

SERIES 1

10 kA

120/240

V-

Figure 37 - Circuit Breaker.

Open a hot water faucet and

let the hot water run unl it

is cool.

Figure 38 - Water Faucet.

WARNING! Be sure the water

runs cool before draining the tank to

reduce the risk of scalding.

Connect a garden hose to the

drain valve and place the

other end of the hose in a

drain, outside, or in buckets.

Turn the cold water supply

valve OFF.

Open the drain valve on the

water heater.

Figure 39 - Drain Valve.

Open a hot water faucet to

help the water in the tank

drain faster.

NOTICE: DO NOT reconnect power

to water heater unless the tank is

completely full of water. This is an

addional precauon to protect the

elements against dry re. Dry re

occurs when power is supplied to the

electric elements without sucient

water in the heater. Dry ring the

unit will result in immediate failure

of the element. While this unit is

equipped with dry re protecon, the

recommended pracce is to ensure

the tank is lled with water prior

to supplying power to the unit. For

complete instrucons on lling the

tank, follow “Step 13” on page 16 in

the installaon secon of this manual.

If sediment was present

when the tank was drained,

ush the tank by opening the

cold water supply valve and leng

the water run unl no more sediment

drains from the tank. Close the drain

valve when you are done.

Rell the tank by opening the

cold water supply valve.

Make sure a hot water faucet

MAINTENANCE

Residenal Electric Water Heater Use and Care Guide • 33

MAINTENANCE

is open and the drain valve is closed.

Allow the hot water to run full for at

least three minutes to make sure the

tank has all the air removed and is

completely full of water. Failure to

perform this step can cause the upper

heang element to burn out. Once you

are certain the tank is completely full

of water, close the hot water faucet.

Turn ON power to the water

heater at the circuit breaker/

fuse box. It may take two

hours for the tank to heat up.

Replacing the Anode

Rod

NOTICE: The Control Assembly will

display error code 044 when the anode

rod has been depleted.

To replace the anode rod if it

is depleted: Turn the power

OFF. Run hot water unl it is

cool. Turn cold water supply valve OFF.

Open a hot water faucet to

depressurize tank.

Remove ducng from unit.

Disconnect cold water supply

and hot water supply

connecons from top of unit if

necessary to remove jacket cover.

To avoid damaging gaskets in ex

lines, use a pipe wrench at the hot

and cold nipples to counter torque

when installing or removing water

connecons. DO NOT overghten.

Remove the six (6) screws

located around the perimeter

of the jacket cover. Locate and

remove the two (2) screws on top of

the unit fastening the jacket cover to

the heat pump evaporator. Li the

jacket cover up and away from the unit

to gain access to the anode rod (see

illustraon on back cover for locaon

of anode rod).

Perimeter

Screw (6x)

Evaporator

Screw (2x)

Shroud Cover

Figure 40 - Remove Shroud Cover

Once the anode rod is

exposed, remove the top nut

with a 10 mm hex socket

wrench and remove the wire terminal

(do not remove lower hex nut from

bolt). With the wire terminal removed,

use a 1-1/16” socket wrench with an

extension to remove the anode rod.

Inspect the anode rod and replace if

depleted. Apply thread sealant tape or

pipe joint compound and reinstall the

anode rod ghtly. Connect the wire

terminal and secure with hex nut.

Install jacket cover to water

heater by following the

instrucons outlined in Step 3

in reverse order.

NOTICE: Flex hose connecons must

be aligned with nut retainers to install

shroud cover to shroud. Adjust ex

hoses accordingly.

Reconnect cold water supply

and hot water supply

connecons at top of unit.

Rell the tank by opening the

cold water supply valve. Make

sure a hot water faucet is

open and the drain valve is closed.

Allow the hot water to run full for at

least three (3) minutes to make sure

the tank has all the air removed and is

completely full of water. Failure to

perform this step can cause the upper

heang element to burn out. Once you

are certain the tank is completely full

of water, close the hot water faucet.

Remove the three (3) screws

securing intake duct adaptor

(closest to front side of water

heater) to jacket cover. Li intake duct

adaptor up and away from jacket cover

to visually inspect for leaks around the

anode ng and water connecons. If

there are no leaks, proceed to Step 9.

If there is a leak, turn OFF water supply

to the water heater, open a faucet to

eliminate pressure, and ghten the

anode rod further. Return to Step 7.

Install intake duct adaptor to

jacket cover and secure with

three (3) screws. Reconnect

any ducng to the intake and exhaust

adaptors.

Reconnect power to the water

heater. It may take several

hours for the tank to heat up

depending on the tank size,

temperature seng, and cold water

supply temperature.

Figure 41 - Anode Rods from new (top) to par-

ally depleted (middle) to fully depleted stages

(boom).

Anode Rod. The anode rod is a

sacricial metal rod and is the water

heater’s rst line of defense to prevent

corrosion and premature failure

(leaks) in the tank. The anode rod

is a consumable item. Inspect the

anode rod aer the rst six months of

operaon when you drain and ush

the tank. Replace the anode rod if it

is substanally worn out or depleted.

Thereaer, inspect the anode rod

annually or more frequently if needed.

If you use a water soener, your

34 • Residenal Electric Water Heater Use and Care Guide

MAINTENANCE

anode rod will deplete faster than

normal. Inspect the anode rod more

frequently, replacing the anode rod

as needed. Obtain new anode rods

from Lowe’s® or have a qualied

person replace it (anode rods are a

consumable item and are not covered

under warranty).

Cleaning the Heang

Element

At least annually, inspect upper and

lower elements for scaling or damage

caused by corrosive water condions

and mineral deposits.

Use a so bristle brush to remove

scale from the elements. If necessary,

soak the elements in cider vinegar for

two hours to remove scale.

Follow the instrucons in the next

secon to disconnect power to the

water heater and drain the tank

before accessing the elements.

IMPORTANT! Failure to clean scaling

from elements can lead to corrosion

and premature failure (leaks) in the

tank resulng in property damage.

Replace the heang elements if

necessary.

Replacing the Heang

Element

WARNING! Working near an

energized circuit can result in severe

injury or death from electrical

shock. Turn power OFF. Check wires

with a non-contact circuit tester to

make sure power is OFF. When you

are nished, be sure all covers are

secured to reduce the risk of re and

electric shock.

If you are not comfortable replacing

a heang element or thermostat

yourself, have this work done by

a qualied person. To replace the

heang element, you will need the

following tools and supplies:

OFF

Figure 42 - Non-Contact Circuit Tester.

• Always turn power OFF and check

the power wires with a non-contact

circuit tester before working on the

water heater.

Figure 43 - Heang Element (with gasket).

• Check your water heater’s data plate

for the correct waage and voltage.

Heang elements are available at

Lowe’s®.

Figure 44 - Element Wrench.

• Some regular sockets (1-1/2 inch)

may work, but regular sockets are

oen beveled and may slip. In-

expensive element wrenches are

available at Lowe’s®.

• Garden hose to drain the tank.

• Hand dishwashing liquid to lubricate

the gasket.

• A clean cloth to clean the threaded

opening.

• A at blade and Phillips screwdriver.

Steps for Replacing the

Heang Element:

NOTICE: A diagnosc code (see

“Control Assembly Diagnosc Code

Chart” on page 25) should indicate if

the upper or lower element has failed.

Locate the water heater’s

circuit breaker and turn it

OFF (or remove the circuit’s

fuses).

WATER

HEATER

MICRO-

WAVE

LIVING

ROOM

RANGE

STOVE

20 20

2015

FRIDGE

PLUG

DISH

WASHER

HALL

LIGHTS

LAUNDRY

ROOM

TYPE HOM

SERIES 1

10 kA

120/240 V-

TYPE HOM

SERIES 1

10 kA

120/240 V-

TYPE HOM

SERIES 1

10 kA

120/240 V-

YPE HOM

SERIES 1

10 kA

120/240 V-

TYPE HOM

SERIES 1

10 kA

120/240 V-

TYPE HOM

SERIES 1

10 kA

120/240 V-

TYPE HOM

SERIES 1

10 kA

120/240 V-

TYPE HOM

SERIES 1

10 kA

120/240

V-

Figure 45 - Circuit Breaker.

Open the electrical juncon

box on the side of the water

heater. Using a non-contact

circuit tester, check the power wires

to make certain the power is OFF.

OFF

Ground

Wires

1/2" Conduit

Connection

Black Wires

Red

Wires

Figure 46 - Non-Contact Circuit Tester.

Open a hot water faucet and

let the hot water run unl it

is cool.

WARNING! Be sure the water

runs cool before draining the tank to

reduce the risk of scalding.

Residenal Electric Water Heater Use and Care Guide • 35

MAINTENANCE

Connect a garden hose to the

drain valve and place the

other end of the hose in a

drain or outside (or use buckets). Turn

OFF the cold water valve that supplies

the water heater. Open the drain valve

on the water heater. Opening a hot

water faucet will help the tank drain

faster.

Remove the upper or lower

access panel on the water

heater, and then fold back the

insulaon and remove the plasc

element/thermostat cover.

Figure 47 - Access Panel.

With the tank drained and the

power OFF, remove the power

wires from the element you

intend to replace.

Remove the bad element

using an element wrench.

Make sure the new element is

the correct replacement by

referring to the water heater’s

data plate for voltage and waage

informaon.

Clean the threads in the tank

opening with a rag. Insert the

new element equipped with a

rubber gasket. Use a drop of hand

dishwashing liquid to lubricate the

gasket to help avoid damaging the

gasket as it is being ghtened. Tighten

with an element wrench.

NOTICE: DO NOT turn power back

on unl the tank is completely full of

water. For complete instrucons on

lling the tank, follow “Step 13” on

page 16 in the installaon secon of

this manual.

Rell the tank by opening the

cold water supply valve. Make

sure a hot water faucet is

open and the drain valve is closed.

Allow hot water to run full for at least

three (3) minutes to make sure the

tank has all the air removed and is

completely full of water. Failure to

perform this step can cause the upper

heang element to burn out. Once you

are certain the tank is completely full

of water, close the hot water faucet.

Check the newly installed

element for leaks. If a leak is

present, ghten the element

unl the leak stops. If you cannot stop

the leak, drain the tank and remove

the element. Inspect the gasket for

damage. If the gasket is damaged,

replace the gasket and reinstall the

element.

Once the element is

successfully installed and

there are no leaks, replace the

power wires, thermostat cover,

insulaon, and access panel. Make

sure all wire connecons are ght.

Replace the cover on the electrical

juncon box.

Turn ON power to the water

heater at the circuit breaker/

fuse box. It may take two

hours for the tank to heat up.

Replacing the ECO

WARNING! Working near an

energized circuit can result in severe

injury or death from electrical

shock. Turn power OFF. Check wires

with a non-contact circuit tester to

make sure power is OFF. When you

are nished, be sure all covers are

secured to reduce the risk of re and

electric shock.

To replace the ECO, you will need the

following tools and supplies:

• A non-contact circuit tester. Always

turn power OFF and check with a

non-contact circuit tester before

working on the water heater.

ECO Reset

Button

Figure 48 - ECO

• A replacement ECO (see the repair

parts list on back cover).

• A business card to check the gap

between the ECO and tank.

• Tape and a permanent marker to

mark the wires.

• A at blade and Phillips screwdriver.

36 • Residenal Electric Water Heater Use and Care Guide

MAINTENANCE

Steps for Replacing the

ECO:

Turn the power OFF at the

circuit breaker or remove

fuses.

NOTICE: It is not necessary to drain

the tank to replace an ECO.

Open the electrical juncon

box on the side of the water

heater. Using a non-contact

circuit tester, check the power wires

to make certain the power is OFF.

1/2” Conduit

Opening

Green

Ground

Screw

Green

Ground

Wire

Red Wire

Black Wire

Power Supply

Connector

Figure 49 - Electrical Juncon Box (boom cover

to electrical juncon box removed for clarity).

Remove the upper access

panel on the water heater

and carefully fold back the

insulaon and plasc element/ECO

cover (Figure 50).

Figure 50 - Element Access Panel/ECO Compart-

ment.

Make sure the replacement

ECO matches the original

ECO.

Mark the wires with tape so

you will know how to put

them back on.

Disconnect the wires from

the bad ECO and remove the

ECO from the metal mounng

clip.

Install the new ECO in the

metal mounng clip.

Make sure the new ECO ts

snuggly against the tank. You

should NOT be able to slip a

business card between the ECO and

the tank. If you can, bend the ECO

mounng clip unl the ECO ts ghtly

against the tank.

Aach the wires following

the wiring diagram on the

water heater’s label. Make

sure all wire connecons are ght.

Replace the plasc element/

ECO cover, insulaon, and

access panel.

Replace the cover on the

electrical juncon box.

Turn ON power to the water

heater at the circuit breaker/

fuse box.

T&P Relief Valve

Maintenance

Read and follow the operang and

annual maintenance instrucons

provided by the manufacturer of

the T&P Relief Valve (yellow label

aached to the T&P Relief Valve).

If no label is aached to the T&P

Relief Valve, follow the instrucons

in this secon. Minerals in the

water can form deposits that cause

the valve to sck or create blocked

passages, making the T&P Relief Valve

inoperave. Follow these guidelines:

• At least annually, inspect the T&P

Relief Valve and discharge pipe for

damage caused by corrosive water

condions and mineral depos-

its. Operate the T&P Relief Valve

manually to ensure the waterways

are clear and the valve mechanism

moves freely (below). Before oper-

ang the valve manually, check that

it will discharge in a place for secure

disposal.

Figure 51 - T&P Relief Valve.

WARNING! Hot water will be

released. Before operang the T&P

Relief Valve manually, check that it

will discharge in a safe place. If water

does not ow freely from the end of

the discharge pipe, turn the power to

the water heater OFF. Call a qualied

person to determine the cause.

• Note that a dripping T&P Relief

Valve is usually caused by the

home’s water pressure being too

high or the lack of a Thermal Expan-

sion Tank. If your T&P Relief Valve

drips, see “Drips from T&P Relief

Valve Discharge Pipe” on page 29.

Residenal Electric Water Heater Use and Care Guide • 37

MAINTENANCE

Air Filter Maintenance

The heater will monitor the heat pump

operaon status and indicate whether

the lter should be cleaned. If the

Control Assembly displays the code

080, this indicates the lter should be

cleaned or replaced with the following

process (see exploded view of the unit

on page 39 for air lter locaon).

NOTICE: Before aempng to clean

or replace the air lter, turn OFF the

power to the water heater at the

circuit breaker/fuse box.

Take the tab on the air lter

and remove (slide) it from the

top facing air intake duct

adaptor.

To clean the lter, use a

vacuum with a hose

aachment to remove any

dust or debris.

Slide the new or cleaned lter

into the air intake duct

adaptor.

Turn ON power to the water

heater at the circuit breaker/

fuse box.

NOTICE: The water heater may

conduct a system diagnosc prior to

operaon.

Condensate Drain

Maintenance

NOTICE: Before aempng to clean

the condensate drain pan or lines, turn

power OFF to the water heater at the

circuit breaker/fuse box.

Check the condensate drain

pan and drain lines for any dirt

or debris that might interfere

with proper drainage.

Use a pipe cleaner to clear

debris from condensate drain,

condensate line, and

condensate drain pan.

Once the condensate drain

pan and lines have been

inspected/cleaned, turn ON

power to the water heater at the

circuit breaker/fuse box.

NOTICE: The water heater will conduct

a system diagnosc prior to operaon.

Control Assembly

Baery Maintenance

CAUTION! Baery May Explode

If Mistreated. Do Not Recharge,

Disassemble Or Dispose Of In Fire.

It is recommended to replace the

baery in the Control Assembly every

ve (5) years for reliability.

Locate the baery tray on the le side

of the Control Assembly (Figure 52).

ENTER

Battery

Tray

Figure 52 - Baery Tray locaon.

Replace the BR2032 or CR2032 baery

by removing the Phillips head screw

and sliding the baery tray out from

the Control Assembly. Replace baery

with Panasonic® BR2032 or Murata

CR2032 only. Insert baery into the

tray and reinstall into the Control

Assembly. Hand ghten the Phillips

head screw to secure the tray in the

Control Assembly.

CAUTION! Use of Another Baery

May Present A Risk Of Fire Or

Explosion.

NOTICE: If the Control Assembly was

not connected via Wi-Fi, Bluetooth, or

will need to be set.

MAINTENANCE

38 • Residenal Electric Water Heater Use and Care Guide

CONTROL ASSEMBLY AND THERMOSTAT DIAGRAM

SHUT OFF VALVE

BLUE

BLACK

GREEN

YELLOW

AMBIENT TEMP. SENSOR

COIL TEMP. SENSOR

SUCTION TEMP. SENSOR

DISCHARGE TEMP. SENSOR

CONDENSATE WATER

ALARM SIGNAL

TO DAUGHTER

BOARD

ANODE

(OPTION OF WATER

TEMP. SENSOR AND

BYPASS VALVE FOR

PREMIUM MODEL)

FAN MOTOR

BLACK

TANK LOWER TEMP. SENSOR

RED

A-A

B-B

TANK UPPER TEMP. SENSOR

EEV

TO MAIN

CONTROL

BOARD

TANK

A-A

TANK LOWER

TEMP. SENSOR

B-B

TANK UPPER

TEMP. SENSOR

BLACK

RED

BLUE

WHITE

LOWER ELEMENT

4.5KW

BLACK

UPPER ELEMENT

4.5KW

HIGH LIMIT

SWITCH

MOTOR

PROTECTOR

TANK TOP

COVER

COMPRESSOR

CAPACITOR

OPTIONAL OVERFLOW SWITCH

NORMALLY CLOSED

FIELD WIRING

FACTORY WIRING

JUNCTION

BOX

L1 L2 G

BLACKRED

TANK

JACKET

GREEN

RED

WHITE

RED

BLACK

RED

BLUE

WHITE

RED

CONDENSATE WATER

LEVEL SWITCH

240VAC 50Hz/60Hz 1Φ

208VAC 50Hz/60Hz 1Φ

DIAGRAMS

Residenal Electric Water Heater Use and Care Guide • 39

REPAIR PARTS

10 11

Quick Release

to remove valve body

REPAIR PARTS

Repair parts may be ordered through your plumber, local

distributor, home improvement center, or by calling our Technical

Assistance Hotline which is listed on your warranty. When

ordering parts, always give the following informaon:

1. Model, serial and product number

2. Item number

3. Parts descripon

Anode

T&P Valve

Control Assembly

Front of Unit

Back of Unit

37” for all models

ColdHot

ITEM NO. PARTS DESCRIPTION

1 Air Filter

2 Fan Motor Assembly

3 Electronic Expansion Valve Solenoid

4 Control Assembly

5 Daughter Board, 208V/240V

6 Run Capacitor

7 Smart Valve Assembly

8 Flex Hoses (2x), Gaskets

9 Inlet / Outlet T-Nipple Assembly

Dip Tube, for 40 & 50 gallon

Dip Tube, for 66 gallon

Dip Tube, for 80 gallon

11 Anode Rod, 37” for all models

12 Upper Element Personnel Protector

13 Energy Cut-O (ECO) Switch

14 Element Access Panel

15 Element, 4500 Was

16 Temperature & Pressure Relief Valve

17 Condensate Drain Valve

18 Condensate Drain Switch

19 Leak Detecon Sensor

20 Lower Element Personnel Protector

21 Drain Valve

22 Automac Cold Water Shut-O Valve

23 Outlet Thermistor Assembly*

24 Upper / Lower Tank Thermistor Assembly*

Ambient / Discharge / Coil / Sucon

Temperature Sensor Assembly*

*Not shown

REPAIR PARTS

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LOWE’S is a registered Trademark of LF, LLC.

Limited Warranty provided by Manufacturer.

AO Smith HPA10-50H45DV Smart Hybrid Heat Pump Water Heater 50-Gallon

Product's Documents

Installation Manual

Specifications

AO Smith HPA10-50H45DV Questions and Answers