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TROUBLESHOOTING
26 • Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide
WARNING! Because higher tempera-
tures increase the risk of scalding, if
you set the thermostat(s) higher than
120°F, Thermosta c Mixing Valves
at each point-of-use are par cularly
important (page 4).
Water Heater Sounds
During the normal operation of the
water heater, sounds or noises may be
heard. These noises are common and
may result from the following:
• Normal expansion and contraction
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 flush the tank as directed
under the “Draining and Flushing”
section.
The heat pump compressor or fan
running.
Temperature Too High
If the water temperature is too hot:
• Install or adjust the Thermostatic
Mixing Valves for each point-of-use
(see manufacturer’s instructions), or
• Adjust the thermostat(s) on the
water heater (see Step 10 in the
installation section of this manual).
A nonfunc oning thermostat or a
shorted hea ng element can cause
extremely hot water. If the Temperature
and Pressure Relief Valve (T&P Valve)
releases large amounts of very hot wa-
ter, it is likely due to a shorted hea ng
element, or more rarely a nonfunc on-
ing thermostat, or the thermostat does
not fi t snuggly against the tank. Very
high water temperatures can also cause
the Energy Cut Off (ECO) to trip (see
page 19). Turn power off un l this
problem is fi xed.
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 pres-
sure is only on the hot water side, the
primary causes of this are:
• Melted heat traps or dip tube. Solder-
ing copper pipes while they are con-
nected to the water heater can melt
the heat traps inside the hot and cold
water connections or the dip tube
(cold water side). Melted heat traps or
a melted dip tube can restrict the flow
of hot water. If that’s the case, replace
the heat traps or dip tube.
Par ally closed supply valve.
Open the water heater’s supply
valve fully.
Insufficient Hot Water
or Slow Hot Water Re-
covery
WARNING! Because of the increased
risk of scalding, if you set the water
heater’s User Interface Module (UIM)
higher than 120°F, Thermosta c Mixing
Valves at each point-of-use are par cu-
larly important (page 4).
If the hot water is simply not warm
enough, there are several possible
causes:
• Faulty Thermostatic Mixing Valve in a
faucet of shower control (check other
faucets in the house for hot water).
• The User Interface Module (UIM)
temperature set too low.
• Water heater’s capacity too small (or
usage too high).
• Reversed plumbing connections or
melted J-tube (usually found soon
after installation).
• Plumbing leak
• Bad lower heating element
• Low supply voltage.
Thermosta c Mixing Valves. If the hot
water is simply not warm enough, make
sure the faucet you are checkingdoesnt
have a defec ve Thermosta c Mix-
ing Valve. Many shower controls have
built-in mixing valves. If these devices
fail, they can reduce the amount of hot
water the shower of faucet delivers
even though there is plenty of hot wa-
ter in the tank. Always check the water
temperature at several faucets to make
sure the problem is not in a faucet or
shower control.
User Interface Module (UIM) set too
low. If the water temperature at several
faucets is too cool, adjust the UIM ac-
cording to the instruc ons in Step 12 of
the Installa on sec on of this manual.
TROUBLESHOOTING
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