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30 • Residenal Electric Water Heater Use and Care Guide
TROUBLESHOOTING
TROUBLESHOOTING
Water Odor
Harmless bacteria normally present
in tap water can mulply in water
heaters and give o a “roen egg”
smell. A higher tank temperature
seng 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 Thermostac 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,
Thermostac Mixing Valves are
parcularly important (see page 4
and Figure 8).
Water Heater Sounds
During the normal operaon of the
water heater, sounds or noises may be
heard. These noises are common and
may result from the following:
• Normal expansion and contracon
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 “Adjusng
the Control Assembly’s Operaonal
Modes” on page 21).
• Install or adjust a Thermostac
Mixing Valve (see manufacturer’s
instrucons).
A non-funconing thermostat or
a shorted heang 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 heang element, or more
rarely a non-funconing 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 o unl 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 ulity.
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 connecons. Melng 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 connecons.
• Parally closed supply valve. Open
the water heater’s supply valve fully.
Insucient 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,
Thermostac Mixing Valves are
parcularly important (see page 4
and Figure 8).
If the hot water is simply not warm
enough, there are several possible
causes:
• Thermostac Mixing Valve faulty or
set too low.
• Temperature set point too low.
• Hot water usage paern exceeds
the capability of the water heater in
current mode (see “Operang Mode
Descripons” on page 19).
• Water connecons to unit are
reversed (disconnect and re-install
correctly).
• Leak in plumbing system (check
home for any leaks and repair).
• Lower heang element not
funconing properly.
• No power to the water heater (no
lights on the unit are on and display
is blank).
• Unit is in Vacaon Mode.
• ECO tripped.
• Non-funconing upper thermistor
sensor (refer to code 003 in the
“Diagnosc Codes” secon on page
25).
• Air lter is dirty (see “Air Filter
Maintenance” on page 36).
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