AIR CONDITIONER
TROUBLESHOOTING CHART
NO COOLING OR
INSUFFICIENT
COOLING
COMPRESSOR WILL NOT RUN
COMPRESSOR
RUNS BUT
CYCLES ON
INTERNAL
OVERLOAD
COMPRESSOR
RUNS BUT
INSUFFICIENT
COOLING
OUTDOOR FAN
HIGH SUCTION
HIGH SUCTION
CONTACTOR
OPEN
POWER SUPPLY
DEFECTIVE
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
OPEN SHORTED OR GROUNDED COMPRESSOR MOTOR WINDINGS
COMPRESSOR
STUCK
COMPRESSOR
INTERNAL
PROTECTION
OPEN
DEFECTIVE RUN
CAPACITOR
DEFECTIVE
START
CAPACITOR
STOPPED OR CYCLING ON OVERLOAD
OUTDOOR AIR
RESTRICTED OR RECIRCULATING
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
DEFECTIVE
START
CAPACITOR
LOOSE LEAD
AT FAN MOTOR
MOTOR
DEFECTIVE
INCORRECT
OFM
CAPACITOR
LOW SUCTION
PRESSURE
DIRTY AIR
FILTERS
DUCT
RESTRICTED
DAMPERS
PARTLY CLOSED
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
LOW HEAD PRESSURE
DEFECTIVE
COMPRESSOR
VALVES
INTERNAL
PRESSURE
RELIEF OPEN
LOW
SUPERHEAT
UNIT
OVERCHARGED
INCORRECT
SIZE
PISTON
FAILED
TXV
A90208
Fig. 59 – Air Conditioner Troubleshooting Chart
80