18
TROUBLESHOOTING CHART
Complaint
Possible Causes
Too much current passing through thermal protector
Extra sources of current draw
Compressor motor winding shorted
A, COMPRESSOR NOT STARTING – NOT HUMMING.
System component not functioning properly:
Control/contactor stuck in open position
Control off due to cold location
Thermostat not functioning properly
Line disconnect switch open
Circuit breaker tripped or fuse open or removed
Compressor motor winding open or short
Wiring improper or loose
Compressor motor has a ground fault (also known as short circuit to ground)
B, COMPRESSOR NOT STARTING HUMS BUT
TRIPS ON THERMAL PROTECTOR
Improperly wired
Low voltage to compressor
System component, such as thermostat or contractor may not function properly
Compressor electrical problems
Compressor motor winding open or shorted
Faulty relay. Or not functioning properly.
Faulty start capacitor or Not working properly
Liquid refrigerant in compressor.
C. COMPRESSOR STARTS AND RUNS, BUT SHORT CYCLES
ON THERMAL PROTECTOR
