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Electrical Troubleshooting Chart
(Heat Pump)
Reversing Valve Stuck
Replace the Reversing Valve
Replace the Solenoid Coil
NO
Is the Solenoid Coil Good?
Is Line Voltage
Present at the Solenoid
Is the Selector Switch
Set for Heat?
NO
SYSTEM COOLS WHEN
HEATING IS DESIRED.
YES
HEAT PUMP
YES
Troubleshooting Chart — Heating
Noncondensables (air) in
System
Overcharged
Low Airflow Across
Indoor Coil
Outdoor Ambient Too High
For Operation In Heating
High Head Pressure
REFRIGERANT SYSTEM
DIAGNOSIS – HEATING
Moisture in System
Defective Compressor Defective Compressor
Undercharged Overcharged
Undercharged
Refrigerant System
Restriction
Reversing Valve not
Fully Seated
Low Airflow
Across Outdoor Coil
Outdoor Ambient Too High
for Operation in Heating
Refrigerant System
Restriction
Low Suction Pressure High Suction Pressure Low Head Pressure
Reversing Valve not
Fully Seated