LG LFX28968SW Service Manual - Page 65

Refrigeration Cycle

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12-6 REFRIGERATION CYCLE ▼ Troubleshooting Chart CLOGGED BY DUST LEAKAGE CAUSE PARTIAL LEAKAGE COMPLETE LEAKAGE PARTIAL CLOG WHOLE CLOG MOISTURE CLOG STATE OF THE UNIT Freezer compartment and Refrigerator don't cool normally. Freezer compartment and Refrigerator don't cool normally. Freezer compartment and Refrigerator don't cool normally. Freezer compartment and Refrigerator don't cool. Cooling operation stops periodically. STATE OF THE EVAPORATOR Low flowing sound of Refrigerant is heard and frost forms in inlet only. TEMPERATURE OF THE COMPRESSOR A little higher than ambient temperature. REMARKS • Refrigerant level is low due to a leak. • Normal cooling is possible by restoring the normal amount of refrigerant and repairing the leak. Flowing sound of refrigerant is not heard and frost isn't formed. Equal to ambient temperature. • No discharging of Refrigerant. • Normal cooling is possible by restoring the normal amount of refrigerant and repairing the leak. Flowing sound of refrigerant is heard and frost forms in inlet only. A little higher than ambient temperature. • Normal discharging of the refrigerant. • The capillary tube is faulty. Flowing sound of refrigerant is not heard and frost isn't formed. Equal to ambient temperature. • Normal discharging of the Refrigerant. Flowing sound of Lower than ambient • Cooling operation restarts refrigerant is not temperature. when heating the inlet of the heard and frost melts. capillary tube. DEFECTIVE COMPRESSION COMPRESSION NO COMPRESSION Freezer and Refrigerator don't cool. No compressing operation. Low flowing sound of refrigerant is heard and frost forms in inlet only. A little higher than ambient temperature. Flowing sound of refrigerant is not heard and there is no frost. Equal to ambient temperature. • Low pressure at high side of compressor due to low refrigerant level. • No pressure in the high pressure part of the compressor. 12-6-1 Cleaning There is no need for routine condenser cleaning in normal Home operating environments. If the environment is particularly greasy or dusty, or there is significant pet traffic in the home, the condenser should be cleaned every 2 to 3 months to ensure maximum efficiency. If you need to clean the condenser: ● Remove the mechanical cover. ● Use a vacuum cleaner with a soft brush to clean the grille, the open areas behind the grille and the front surface area of the condenser. ● Replace the mechanical cover. - 65 -

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- 65 -
12-6 REFRIGERATION CYCLE
▼
Troubleshooting Chart
PARTIAL
LEAKAGE
Freezer
compartment and
Refrigerator don't
cool normally.
Low flowing sound of
Refrigerant is heard
and frost forms in
inlet only.
A little higher than
ambient
temperature.
•
Refrigerant level is low due
to a leak.
•
Normal cooling is possible by
restoring the normal amount
of refrigerant and repairing
the leak.
COMPLETE
LEAKAGE
Freezer
compartment and
Refrigerator don't
cool normally.
Flowing sound of
refrigerant is not
heard and frost isn't
formed.
Equal to ambient
temperature.
•
No discharging of
Refrigerant.
•
Normal cooling is possible by
restoring the normal amount
of refrigerant and repairing
the leak.
LEAKAGE
PARTIAL
CLOG
Freezer
compartment and
Refrigerator don't
cool normally.
Flowing sound of
refrigerant is heard
and frost forms in
inlet only.
A little higher than
ambient
temperature.
•
Normal discharging of the
refrigerant.
•
The capillary tube is faulty.
WHOLE
CLOG
Freezer
compartment and
Refrigerator don't
cool.
Flowing sound of
refrigerant is not
heard and frost isn't
formed.
Equal to ambient
temperature.
•
Normal discharging of the
Refrigerant.
MOISTURE CLOG
Cooling operation
stops periodically.
Flowing sound of
refrigerant is not
heard and frost melts.
Lower than ambient
temperature.
•
Cooling operation restarts
when heating the inlet of the
capillary tube.
CLOGGED BY DUST
COMP-
RESSION
Freezer and
Refrigerator don't
cool.
Low flowing sound of
refrigerant is heard
and frost forms in
inlet only.
A little higher than
ambient
temperature.
•
Low pressure at high side of
compressor due to low
refrigerant level.
NO COMP-
RESSION
No compressing
operation.
Flowing sound of
refrigerant is not
heard and there is
no frost.
Equal to ambient
temperature.
•
No pressure in the high
pressure part of the
compressor.
DEFECTIVE
COMPRESSION
CAUSE
REMARKS
STATE OF THE
EVAPORATOR
TEMPERATURE
OF THE
COMPRESSOR
STATE OF
THE UNIT
12-6-1 Cleaning
There is no need for routine condenser cleaning in normal Home operating environments. If the environment is
particularly greasy or dusty, or there is significant pet traffic in the home, the condenser should be cleaned
every 2 to 3 months to ensure maximum efficiency.
If you need to clean the condenser:
●
Remove the mechanical cover.
●
Use a vacuum cleaner with a soft brush to clean the grille, the open areas behind the grille and the front
surface area of the condenser.
●
Replace the mechanical cover.