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4. TROUBLESHOOTING
TROUBLE
CAUSE
REMEDY
4.1 Compressor does not start (no hum),
but condenser fan motor runs
A. Compressor relay or overload
malfunctioning.
B. Inadequate voltage.
C. Incorrect wiring.
D. Compressor malfunctioning
A. Replace compressor relay or overload.
B. Measure voltage across common and
run terminal on compressor. Voltage must
not drop below 90% of rated voltage.
C. Refer to wiring diagram and correct.
D. Replace compressor.
4.2 Compressor starts and continues to
run until freeze up and will not cut off
A. Ice bank control failure
B. Incorrect wiring.
A. Replace ice bank control.
B. Refer to wiring diagram and correct.
4.3 Compressor does not start but hums
A. Inadequate voltage.
B. Incorrect wiring.
C. Starting relay malfunctioning.
D. Compressor malfunctioning
A. Measure voltage across common and
run terminal on compressor. Voltage must
not drop below 90% of rated voltage
B. Refer to wiring diagram and correct
C. Replace starting relay. Be sure to use
correct relay. Failure to use correct relay
will cause compressor failure.
D. Replace compressor
4.4 Compressor starts but does not
switch off start winding (will run for only
a few seconds before internal overload
switches compressor off).
A. Inadequate voltage.
B. Incorrect wiring.
C. Starting relay malfunctioning
A. Measure voltage across common and
run terminal on compressor.
B. Refer to wiring diagram and correct
C. Replace starting relay. Be sure to use
correct relay. Failure to use correct relay
will cause compressor failure.
4.5 Compressor starts and runs a short
time but shuts off on overload
A. Dirty condenser
B. Insufficient or blocked air flow.
C. Inadequate voltage.
D. Incorrect wiring.
E. Defective condenser fan.
F. Refrigerant leak.
G. Compressor malfunctioning
A. Clean the condenser.
B. Remove all obstructions and allow for
minimum clearances of 15 inches (380
mm) over top.
C. Measure voltage across common and
run terminal on compressor. Voltage must
not drop below 90% of rated voltage.
D. Refer to wiring diagram and correct.
E. Replace condenser fan motor.
F. Repair and recharge.
G. Replace compressor