LG Electronics LRTN22310, LRTN19310 service manual Refrigerating Cycle

6-5 REFRIGERATING CYCLE

▼Troubleshooting Chart

CAUSE

		PARTIAL
		LEAKAGE
LEAKAGE		COMPLETE
RESTRICTEDBY		LEAKAGE
		WHOLE
		PARTIAL
		RESTRICTION
DUST		RESTRICTION
	MOISTURE
	RESTRICTION
DEFECTIVE COMPRESSION		COMP-
		RESSION
		NO COMP-
		RESSION

STATE OF	STATE OF THE	TEMPERATURE	REMARKS
		OF THE
THE UNIT	EVAPORATOR
		COMPRESSOR
Freezer	Low flowing sound of	A little higher	• Refrigerant level is low due
compartment and	Refrigerant is heard and	than ambient	• to a leak.
Refrigerator don't	frost forms in inlet only.	temperature.	• Normal cooling is possible by
cool normally.			• restoring the normal amount of
			• refrigerant and repairing the leak.
Freezer	Flowing sound of refrigerant	Equal to ambient	• No discharging of Refrigerant.
compartment and	is not heard and frost isn't	temperature.	• Normal cooling is possible by
Refrigerator don't	formed.		• restoring the normal amount of
cool normally.			• refrigerant and repairing the leak.
Freezer	Flowing sound of refrigerant	A little higher	• Normal discharging of the
compartment and	is heard and frost forms	than ambient	• refrigerant.
Refrigerator don't	in inlet only.	temperature.	• The capillary tube is faulty.
cool normally.
Freezer	Flowing sound of refrigerant	Equal to ambient	• Normal discharging of the
compartment and	is not heard and frost isn't	temperature.	• Refrigerant.
Refrigerator don't cool.	formed.
Cooling operation	Flowing sound of refrigerant	Lower than	• Cooling operation restarts
stops periodically.	is not heard and frost melts.	ambient	• when heating the inlet of the
		temperature.	• capillary tube.
Freezer and	Low flowing sound of	A little higher	• Low pressure at high side
Refrigerator	refrigerant is heard and	ambient	• of compressor due to low
don't cool.	frost forms in inlet only.	temperature.	• refrigerant level.
No compressing	Flowing sound of refrigerant	Equal to ambient	• No pressure in the high
operation.	is not heard and there is	temperature.	• pressure part of the
	no frost.		• compressor.

▼Leakage Detection

●Observe the discharging point of the refrigerant, which may be in the oil discharging part of the compressor and in a hole in the evaporator.

Check if compressor

YES

Check if frost

Check if oil

forms in

runs.

No frost

leaks.

Evaporator.

or frost forms

in inlet only

Frost formed normally

Observe the discharged

amount of Refrigerant.

Normal amount

None or too much

YES

Moisture Clog

Faulty

Inject refrigerant in compressor

Compressor.

and check cooling operation.

Check Compressor

Clogged by dust.

Gas leakage.

Frost formed normally (Find the leak and repair it)

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