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TROUBLESHOOTING
User Interface Module (UIM) set too
low. If the water temperature at several
faucets is too cool, adjust the UIM ac-
cording to the instructions in Step 12 of
the Installation section of this manual.
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 condition, you may be able to
meet your families hot water needs with
the existing water heater by installing a
Thermostatic Mixing Valve and then set-
ting the temperature to a higher setting
on the UIM. See "Step 12" on page 16.
You can also reduce your homes hot
water needs by washing clothes in cold
water, installing flow restrictors on
shower heads, repairing leaky faucets,
and taking other conservative steps.
Reversed connections or melted J-tube.
Check the hot and cold connections and
make sure your homes hot water pipe
is connected to the hot water outlet
on the water heater. Usually reversed
connections are found soon after the
installation of a new unit. If copper pipes
were soldered while they were attached
to the water heater, the J-tube may have
melted. The J-tube is a curved plastic
tube inside the tank attached to the cold
water inlet. If the J-tube has melted, it
can be replaced by removing the old
J-tube and installing a new one.
Plumbing leak. Even a small leak in the
hot water side of the homes plumb-
ing system can make it appear that the
water heater is producing little or no hot
water. Locate and repair the leak.
Lower heating element not working.
If the lower heating 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 page 27).
Power Cycling the Unit:
Find and turn off the water
1
heater's circuit breaker or
remove disconnects.
Find electrical junction box on
2
side of water heater, remove
cover and identify the two (2)
power wires.
Turn circuit breaker back on (or
3
re-install the disconnects) and
check for power on both
incoming power wires using a voltmeter.
Again, turn off water heater's
4
circuit breaker, or remove
disconnect and replace
electrical junction box cover, before
performing maintenance work.
NOTE: When powered on the unit will
start to run a system diagnostic. This
typically takes eight (8) minutes and
the UIM will display - -- --- repetitively
during this period.
WARNING! Working near an ener-
gized circuit can result in severe injury
or death from electrical shock.
WARNING! When you are finished,
be sure all covers are secured to reduce
the risk of fire and electric shock.
Residential Hybrid Electric Heat Pump Water Heater Use and Care Guide • 25
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Troubleshooting
