TROUBLESHOOTING CHART — COOLING
REFRIGERANT SYSTEM DIAGNOSIS COOLING
Low Suction Pressure
High Suction Pressure
Low Head Pressure
High Head Pressure
Low Load Conditions
Low Air Flow Across
Indoor Coil
Refrigerant System
Restriction
Undercharged
High Load Conditions
High Air Flow Across
Indoor Coil
Reversing Valve not
Fully Seated
Overcharged
Low Load Conditions
Refrigerant System
Restriction
Reversing Valve not
Fully Seated
Undercharged
in System
High Load Conditions
Low Air Flow Across
Outdoor Coil
Overcharged
Moisture in System
Defective Compressor
Defective Compressor
TROUBLESHOOTING CHART — HEATING
REFRIGERANT SYSTEM DIAGNOSIS HEATING
Low Suction Pressure
High Suction Pressure
Low Head Pressure
High Head Pressure
Low Air Flow Across
Outdoor Coil
Refrigerant System
Restriction
Outdoor Ambient Too High for Operation in Heating
Reversing Valve not
Fully Seated
Refrigerant System
Restriction
Reversing Valve not
Fully Seated
Outdoor Ambient Too High For Operation In Heating
Low Air Flow Across
Indoor Coil
Undercharged
Overcharged
Undercharged
Overcharged
Moisture in System
Defective Compressor
Defective Compressor
in System
41
