System Maintenance; Service - Whirlpool Gold WPH43M Installation Instructions Manual

WARNING
HIGH VOLTAGE!
Disconnect ALL power before servicing.
Goodman 6
Multiple power sources may be present.
Failure to do so may cause property damage,
personal injury or death.
The self-contained package air conditioner or heat pump should
operate for many years without excessive service calls if the unit
is installed properly. However, it is recommended that the
homeowner inspect the unit before a seasonal start-up. The coils
should be free of debris, so adequate airflow is achieved. The
return and supply registers should be free of any obstructions.
The filters should be cleaned or replaced.
These few steps will help to keep the product up time to a
maximum. The System Troubleshooting chart should help in
identifying problems if the unit does not operate properly.
NOTE: The following information is for use by qualified service
agency only. Others should not attempt to service this
equipment.
Common Causes of Unsatisfactory Operation of Heat
Pump on the Heating Cycle.
Inadequate Air Volume Through Indoor Coil
When a heat pump is in the heating cycle, the indoor coil is
functioning as a condenser. The return air filter must always
be clean, and sufficient air volume must pass through the
indoor coil to prevent excessive discharge pressure, and high
pressure cutout.
14

SYSTEM MAINTENANCE

Service

Outside Air Into Return Duct
Do not introduce cold outside air into the return duct of a heat
pump installation. Do not allow air entering the indoor coil to
drop below 65°F (18ºC). Air below this temperature will cause
low discharge pressure, thus low suction pressure, and
excessive defrost cycling resulting in low heating output. It
may also cause false defrosting.
Undercharge
An undercharged heat pump on the heating cycle will cause
low discharge pressure resulting in low suction pressure and
frost accumulation on the outdoor coil.
Poor "Terminating" Sensor Contact
The defrost terminating sensor must make good thermal
contact with the outdoor coil tubing. Poor contact may not
terminate the defrost cycle quickly enough to prevent the unit
from cutting out on high discharge pressure.
Malfunctioning Reversing Valve
This may be due to:
1. Solenoid not energized—In order to determine if the
solenoid is energized, touch the nut that holds the
solenoid cover in place with a screwdriver. If the nut
magnetically holds the screwdriver, the solenoid is
energized and the unit is in the cooling cycle.
2. No voltage at the solenoid—Check unit voltage. If no
voltage, check wiring circuit.
3. Valve will not shift—If the unit is undercharged, check for
leaks. If valve body damaged, replace valve. If unit is
properly charged, and it is on the heating cycle, raise the
discharge pressure by restricting airflow through the
indoor coil. If the valve does not shift, tap it lightly on both
ends with a screwdriver handle.
NOTE: Do not tap the valve body.
If the unit is on the cooling cycle, raise the discharge
pressure by restricting airflow through the outdoor coil. If
the valve does not shift after the above attempts, turn off
the unit and wait until the discharge and suction pressure
equalize, and repeat above steps. If the valve does not
shift, replace it.