REFRIGERANT SYSTEM DIAGNOSIS COOLING
REFRIGERANT SYSTEM DIAGNOSIS HEATING
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
Non-Condensables (air)
Undercharged System
Moisture in System Defective Compressor Defective Compressor
LOW SUCTION PRESSURE HIGH SUCTION PRESSURE LOW HEAD PRESSURE HIGH HEAD PRESSURE
LOW SUCTION PRESSURE HIGH SUCTION PRESSURE LOW HEAD PRESSURE HIGH HEAD PRESSURE
PROBLEM PROBLEM PROBLEM PROBLEM
PROBLEM PROBLEM PROBLEM PROBLEM
Low Air Flow Across Outdoor Ambient Too High Refrigerant System Outdoor Ambient Too High
Outdoor Coil for Operation in Heating Restriction For Operation In Heating
Refrigerant System Reversing Valve not Reversing Valve not Low Air Flow Across
Restriction Fully Seated Fully Seated Indoor Coil
Undercharged Overcharged
Defective Compressor
Undercharged Overcharged
Moisture in System Defective Compressor
Non-Condensables (air)
in System
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