Friedrich 2007 - Manual (Page 23)

23
ELECTRICAL TROUBLESHOOTING CHART — HEAT PUMP
NO
Is Line Voltage
Present at the Solenoid
NO
YES
YES
TROUBLESHOOTING CHART — HEATING
Noncondensables (air)
Overcharged
Low Airfl ow Across
Indoor Coil
Outdoor Ambient Too High
For Operation In Heating
High Head Pressure
REFRIGERANT SYSTEM DIAGNOSIS – HEATING
Moisture in System Defective Compressor
Undercharged Overcharged
Refrigerant System
Restriction
Reversing Valve not
Fully Seated
Low Airfl ow
Across Outdoor Coil
Outdoor Ambient Too High
for Operation in Heating
Low Suction Pressure High Suction Pressure
Refrigerant System
Restriction
Low Head Pressure
Reversing Valve not
Fully Seated
Undercharged
Defective Compressor
Is the Solenoid Coil Good?
Reversing Valve Stuck
Replace the Reversing Valve
Replace the Solenoid Coil
Is the Selector Switch
Set for Heat?
HEAT PUMP
SYSTEM COOLS WHEN
HEATING IS DESIRED.