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TROUBLESHOOTING CHART — COOLING
TROUBLESHOOTING CHART - HEATING
Moisture in System Defective Compressor Defective Compressor
Non-condensables (air)
in System
Undercharged Overcharged Undercharged Overcharged
Refrigerant System
Restriction
Reversing Valve not
Fully Seated
Low Airfl ow Across
Indoor Coil
Low Airfl ow
Across Outdoor Coil
Out door Ambient Too High
for Op er a tion in Heat ing
Refrigerant System
Restriction
Outdoor Ambient Too High
For Operation In Heating
Low Suction Pressure High Suction Pressure Low Head Pressure High Head Pres sure
REFRIGERANT SYSTEM
DIAGNOSIS – HEATING
Re vers ing Valve not
Fully Seat ed
REFRIGERANT SYSTEM
DIAGNOSIS COOLING
Low Suction Pressure High Suction Pressure Low Head Pressure High Head Pressure
Low Load Conditions High Load Conditions Low Load Conditions High Load Conditions
Low Air Flow Across High Air Flow Across Refrigerant System Low Air Flow Across
Indoor Coil Indoor Coil Restriction Outdoor Coil
Refrigerant System Reversing Valve not Reversing Valve not
Overcharged
Restriction Fully Seated Fully Seated
Undercharged Overcharged
Undercharged
Noncondendsables (air)
in System
Moisture in System Defective Compressor Defective Compressor
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