LG Electronics LF300CP(LP-C303R20), LF480CE(LP-C483TA0) Trouble checking by protection devices

	WHAT TROUBLED	COMPLAINTS	HOW TO CHECK	REMEDY
	Electric troubles	Defective contact.	Checking	Repair and clean or
	(Magnetic	Defective contact point.		replace it.
	contactor)	Rusting and faults in the iron
		core contact face. Defective
		contact of the
		operating switch.
	Others	Improper installation
				Correct it.
			Checking
Trouble checking by protection devices

Fault			Cause			Check/Correcitve Action
High Discharge		Condenser cooling air extremely hot or			1. Check the operation of the outdoor motor.
		insufficient air flow through the condenser			2. Check discharge and suction, air
						circulation.
			Inside of the condenser tube is clogged.		Clean condenser coil.
				Purge air from the cycle.
		Air in the refrigeration cooling cycle.
		Suction pressure is higher than standard.
					See "High Suction Pressure".
					1. Check unit operation input
Low		Faulty discharge valves or suction valves of
Discharge		the compressor.			2. Check the suction pressure.
		Refrigerant low-charge or leakage.
					Add refrigerant: repair leakage if any.
		Suction pressure is lower than standard.
					See "Low Suction Pressure".
					1. Check fresh air, intake or check for
	Intake air extemely hot or excessive air flow
High
Suction	through the evaporator coil.					leakage of the return air.
Pressure					2. Check air flow quantity.
		Refrigerant over-charge.			Purge the refrigerant.
		Faulty discharge valve or suction valve of			Check the operating input.
		the compressor.
	Discharge pressure is higher than standard
						See "High discharge Pressure".
		Intake air extremely cold or insufficient air			1. Check air flow quantity.
Low
Suction		flow through the evaporator coil.			2. Check air filter.
Pressure					3. Check evaporator coil frosting
					Add refrigerant, repair leakage, if any.
		Refrigerant short-charge or leakage.
		Restricted liquid in the suction line.			Check the capillary tube and the strainer.

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