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Troubleshooting Common Service Problems
PROBLEM POSSIBLE CAUSE TEST/CORRECTIVE
ACTION
HIGHER THAN EXPECTED
OPERATING COSTS:
Electric mode selected Change to effi ciency or hybrid for
reducing energy costs
Ambient air temperature
preventing compressor operation
Ambient air temperature must
be ≥ 45°F and ≤109°F to enable
compressor operation.
Air fi lter dirty Clean or replace air filter
Temperature set point too high Decrease set point temperature;
see “Adjusting Set Point
Temperature” section (p.13)
Water connections to unit reversed Ensure the cold connection is
at the bottom and that the hot
connection is at the top
Heat lost through long run of
exposed pipe or a recirculation
system
Insulate exposed piping. It may be
necessary to discontinue use of
re-circulation system.
Hot water leak at faucet or piping Repair hot water leaks
Sediment or scale build up in tank Drain and flush tank. Water
conditioning may be required to
minimize build up
DRIP FROM
TEMPERATURE &
PRESSURE RELIEF VALVE:
(Warning: Do not plug or
cap T&P discharge pipe.)
Excessive water pressure Check water supply inlet pressure.
If more than 80 PSIG, install a
pressure reducing valve
Add or service a thermal
expansion tank
See “Closed System/Thermal
Expansion” section (p.10)
Malfunctioning Temperature &
Pressure Relief Valve
Replace the Temperature &
Pressure relief valve.
OTHER:
The heat pump does not run in
effi ciency mode
If ambient temperature is greater
than 109°F or less than 45°F the
heat pump will not operate.
LEAKS AROUND THE
ELEMENTS:
The gasket and or threads are
leaking
Re-seal or replace gasket. See
“Heating Element Replacement”
(p.24), for draining and fi lling
procedures.
See also “Leaks around Tank
Fittings”