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28 • Residenal Electric Water Heater Use and Care Guide
TROUBLESHOOTING
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.
Troubleshoong &
Maintenance
If you are not qualied or are not
comfortable performing any of
the troubleshoong, repair or
maintenance procedures that follow,
call our Technical Assistance Hotline
for further assistance.
Limp Mode
The heater will connue operang
with one failed heang method by
switching into Limp Mode:
• If the Control Assembly determines
that the lower thermistor or
lower element has failed, the
lower element call for heat will be
canceled. The upper element call
for heat will sll allow the upper
element to heat the water as
needed.
• If the Control Assembly determines
that the upper thermistor or upper
element has failed, the lower
element will be allowed to heat the
water as needed.
NOTICE: The Control Assembly will
operate in Limp Mode unl 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 acvated).
• Unit in Vacaon Mode.
• ECO tripped.
• Hot water usage paern exceeds
the capability of the water heater in
current mode.
• Non-funconing upper temperature
sensor.
• Faulty thermostac mixing valve.
• Leak in plumbing system.
Follow these steps to diagnose and
correct common electrical problems:
1
Check the Electrical Power to
the Water Heater.
No hot water is oen cause 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 o (or remove
the circuit’s disconnects).
• Locate the electrical juncon box
on the side of the water heater and
remove the cover.
• Idenfy the two power wires. The
power wires are usually black/black
or black/red. The green or copper
wire is the ground wire.
Figure 32 - 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 o and replace the
cover on the electrical juncon box.
If the water heater is not geng
power, contact a qualied person to
have your home’s wiring or circuit
breakers checked.
2
Check the Upper Heang
Element.
If the water heater is geng electrical
power, check to see if the upper
heang 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 mulmeter
capable of reading resistance.
• Turn the power OFF at the circuit
breaker or remove disconnects.
• Remove the upper access panel.
• Move the insulaon to access the
ECO and heang element.
3
Check the Top Two Screws of
the ECO Using a Non-Contact
Circuit Tester and Conrm
that Power is OFF (screw terminals 1
and 3 in photo on next page).
With the electrical power OFF, remove
the two power wires from the upper
heang element.
Figure 33 - Use a multimeter to check the
resistance of the upper heating element.
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