TR
OUBLE
SHOO
TING
26
•
Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide
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 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 O
ff
(ECO) to trip (see
page 24). Turn power o
ff
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.
Insu
ffi
cient Hot Water
or Slow Hot Water Re-
covery
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 checking
doesn’t have a defec ve Thermosta c
Mixing Valve. Many shower controls
have built-in mixing valves. If these de-
vices fail, they can reduce the amount
of hot water the shower of 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.
User Interface Module (UIM) set too
low.
If the water temperature at several
faucets is too cool, adjust the UIM
according to the instruc ons in “Step
12:” of the Installa on sec on of this
manual.
TROUBLESHOOTING
