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Fails to Start
Check of circuit breaker
and fuse.
Gas leakage of feeler bulb
of thermostat
Check of control switch.
Only fan fails to start.
Improper wiring
Defect of fan motor
capacitor
Resistance irregular motor
( ).
Insulation irregular motor
( ).
Replacement of fan motor
Regular but fails to start
Replacement of compressor
(Locking of rotor, metal)
Improper thermostat setting
Loose terminal connection
Improper wiring
Irregular motor resistance ( )
Irregular motor insulation ( )
Replacement of compressor
(Motor damaged)
Drop of power voltage
Check capacitor.
Replacement
Only compressor fails to
start.
Defect of compressor
capacitor
Check of power source.
Check of control switch
setting.