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Fault Cause Check/Correcitve Action
Internal
Thermostat
Cut-Off
Overcurrent
Relay for
Compressor
Cut-Off
Overcurrent
Relay for
Fan Motor
Cut-Off
Fuse Blown
Disconnection
and Faulty
Contact
Discharge pressure is lower than standard.
Single or three phases running.
High or low voltage or phase unbalance.
Refrigerant short charge or leakage.
Compressor frequently stops and starts.
Discharge and suction pressure are
extremely high.
High or low voltage, or phase unbalance.
Single or three phases running
Faulty compressor motor.
Loose connections.
Compressor frequently stops and starts.
High or low voltage, or phase unbalance.
Single or three phases running.
Faulty fan motor.
Loose connection.
Faulty fan bearing.
Loose connections.
Single or three phase running.
Faulty motor.
Disconnection.
Faulty contact.
See "Low Discharge Pressure".
Check the power supply line and the
contactor.
Check the voltage and phase unbalance.
Add refrigerant, repair leakage, if any.
Check thermistor operation, or any other
cause for frequent stop and start operation.
See "High Discharge Pressure" or "High
Suction Pressure".
Check the voltage and phase unbalance.
Check the power supply line and the
contact.
Check electric resistance among the
compressor terminals, and from the
terminals to ground.
Check the electric connections.
Check the operation of the thermistor, or
any other cause for frequent stop.
Check the voltage and electric wiring.
Check the power supply line and the
contactor.
Check the fan motor and wiring.
Check the elelctric connections.
Check repair or replace the bearing.
Check the electric connections.
Check the power supply line.
Check electric resistance among motor
housing, and from the terminals to
ground.
1. Check the wires and connect where
necessary.
2. Check the contact holding coil.
Check the contact in the magnetic
contact, the over-current relay, the
pressure control switch, the operation
switch, the auxiliary relay.