LG Electronics LF300CP(LP-C303R20), LF480CE(LP-C483TA0) service manual

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

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