HEAT PUMP ROOM AIR CONDITIONERS: TROUBLE SHOOTING TIPS
REFRIGERANT SYSTEM DIAGNOSIS - HEATING CYCLE
LOW SUCTION PRESSURE 
HIGH SUCTION PRESSURE
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Low Airflow |
| Outdoor Ambient Too High | ||
Across Outdoor Coil |
| for Operation in Heating | ||
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Refrigerant System |
| Reversing Valve not | ||
Restriction |
| Fully Seated | ||
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Undercharged |
| Overcharged | ||
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Moisture in System |
| Defective Compressor | ||
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LOW HEAD PRESSURE
Refrigerant System
Restriction
Reversing Valve not Fully Seated
Undercharged
Defective Compressor
HIGH HEAD PRESSURE
Outdoor Ambient Too High For Operation In Heating
Low Airflow Across
Indoor Coil
Overcharged
Noncondensables (air)
in System
ELECTRICAL TROUBLESHOOTING CHART - HEAT PUMP
HEAT PUMP
SYSTEM COOLS WHEN
HEATING IS DESIRED.
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Is Line Voltage |
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| Is the Selector Switch | ||||
Present at the Solenoid | NO |
| Set for Heat? | |||||
| YES |
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Is the Solenoid Coil Good? |
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| Replace the Solenoid Coil | ||||
NO | ||||||||
| YES |
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Reversing Valve Stuck |
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Replace the Reversing Valve |
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