Refrigerant System Diagnosis Cooling; Refrigerant System Diagnosis Heating; Troubleshooting Charts - Friedrich H)A09K25 Service Manual

TROUBLESHOOTING CHART — COOLING

REFRIGERANT SYSTEM DIAGNOSIS COOLING

Low Suction Pressure
Low Load Conditions
Low Air Flow Across
Indoor Coil
Refrigerant System
Restriction
Undercharged
Moisture in System
TROUBLESHOOTING CHART — HEATING

REFRIGERANT SYSTEM DIAGNOSIS HEATING

Low Suction Pressure
Low Air Flow Across
Outdoor Coil
Refrigerant System
Restriction
Undercharged
Moisture in System
High Suction Pressure
High Load Conditions
High Air Flow Across
Indoor Coil
Reversing Valve not
Fully Seated
Overcharged
Defective Compressor
High Suction Pressure
Outdoor Ambient Too High
for Operation in Heating
Reversing Valve not
Fully Seated
Overcharged
Defective Compressor
Low Head Pressure
Low Load Conditions
Refrigerant System
Restriction
Reversing Valve not
Fully Seated
Undercharged
in System
Defective Compressor
Low Head Pressure
Refrigerant System
Restriction
Reversing Valve not
Fully Seated
Undercharged
Defective Compressor
High Head Pressure
High Load Conditions
Low Air Flow Across
Outdoor Coil
Overcharged
Non-Condensables (air)
High Head Pressure
Outdoor Ambient Too High
For Operation In Heating
Low Air Flow Across
Indoor Coil
Overcharged
Non-Condensables (air)
in System
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