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NO COOLING OR
INSUFFICIENT
COOLING
COMPRESSOR
WILL NOT RUN
CONTACTOR
OPEN
POWER SUPPLY
DEFECTIVE
LOW-VOLTAGE
TRANSFORMER
OPEN
THERMOSTAT
OPEN CONTROL
CIRCUIT
LOSS OF
CHARGE
CONTACTOR OR
COIL DEFECTIVE
LOOSE
ELECTRICAL
CONNECTION
CONTACTOR
CLOSED
COMPRESSOR
POWER SUPPLY
OPEN
LOOSE LEADS AT
COMPRESSOR
FAULTY START
GEAR (1-PH)
OPEN SHORTED
OR GROUNDED
COMPRESSOR
MOTOR
WINDINGS
COMPRESSOR
STUCK
COMPRESSOR
INTERNAL
PROTECTION
OPEN
DEFECTIVE RUN
CAPACITOR
OUTDOOR FAN
STOPPED OR
CYCLING ON
OVERLOAD
OUTDOOR AIR
RESTRICTED OR
RECIRCULATING
DAMAGED OR
STUCK
REVERSING
VALVE
RESTRICTED
DISCHARGE
TUBE
OVERCHARGE
OR NON-
CONDENSABLES
IN SYSTEM
LOW
REFRIGERANT
CHARGE
LINE VOLTAGE
TOO HIGH OR
LOW
DEFECTIVE RUN
CAPACITOR
COMPRESSOR
BEARINGS
HIGH
SUPERHEAT
LOOSE LEAD
AT FAN MOTOR
DEFROST RELAY
N.C. CONTACTS
OPEN
MOTOR
DEFECTIVE
LOW SUCTION
PRESSURE
DIRTY AIR
FILTERS
DUCT
RESTRICTED
DAMPERS
PARTLY CLOSED
COMPRESSOR
RUNS BUT
CYCLES ON
INTERNAL
OVERLOAD
COMPRESSOR
RUNS BUT
INSUFFICIENT
COOLING
INCORRECT
OFM
CAPACITOR
DEFECTIVE
DEFROST
THERMOSTAT
INDOOR COIL
FROSTED
SLIGHTLY
LOW ON
REFRIGERANT
LIQUID LINE
SLIGHTLY
RESTRICTED
PISTON
RESTRICTED
INCORRECT
SIZE
PISTON
INDOOR COIL
STRAINER
RESTRICTED
INDOOR
BLOWER MOTOR
DEFECTIVE OR
CYCLING ON OL
HIGH SUCTION
LOW HEAD
PRESSURE
REVERSING
VALVE HUNG UP
OR INTERNAL
LEAK
DEFECTIVE
COMPRESSOR
VALVES
INTERNAL
PRESSURE
RELIEF OPEN
HIGH SUCTION
LOW
SUPERHEAT
UNIT
OVERCHARGED
INCORRECT
SIZE
PISTON
DEFECTIVE
START
CAPACITOR
DEFECTIVE
START
CAPACITOR
FAILED
TXV
HEAT PUMP
TROUBLESHOOTING COOLING CYCLE
A90207
Fig. 61 – Heat Pump Troubleshooting -- Cooling Cycle