Refrigeration Cycle - LG LTN16385PL Service Manual

6-5. REFRIGERATION CYCLE

Troubleshooting Chart
STATE OF
CAUSE
THE UNIT
Freezer
PARTIAL
compartment and
LEAKAGE
refrigerator don't
cool normally
COMPLETE
Freezer
LEAKAGE
compartment and
refrigerator don't
cool normally
Freezer
PARTIAL
compartment and
CLOG
refrigerator don't
cool normally
Freezer
WHOLE
compartment and
CLOG
refrigerator don't
cool.
Cooling operation
MOISTURE
stops periodically.
CLOG
Freezer and
COMPRE-
refrigerator don't
SSION
cool.
NO
No compressing
COMPRE-
operation.
SSION
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
runs.
Frost formed normally
Moisture Clog
Check Compressor
STATE OF THE
EVAPORATOR
Low flowing sound of
refrigerant is heard and frost
forms in inlet only.
Flowing sound of refrigerant
is not heard and frost isn't
formed.
Flowing sound of refrigerant
is heard and frost forms in
inlet only.
Flowing sound of refrigerant is
not heard and frost isn't
formed.
Flowing sound of refrigerant
is not heard and frost melts.
Low flowing sound of
refrigerant is heard and frost
forms in inlet only.
Flowing sound of refrigerant
is not heard and there is no
frost.
Check if frost
YES
forms in
Evaporator.
Normal amount
Faulty
Compressor.
Clogged by dust.
TEMPERATURE
OF THE
COMPRESSOR
A little higher than
ambient
temperature.
Equal to ambient
temperature.
A little higher than
ambient
temperature.
Equal to ambient
temperature.
Lower than ambient
temperature.
A little higher than
ambient
temperature.
Equal to ambient
temperature
No frost
or frost forms
in inlet only
Observe the discharged
amount of Refrigerant.
Inject refrigerant in compressor
and check cooling operation.
Frost formed normally
- 16 -
REMARKS
- Refrigerant level is low due to a
leak. ¥
- Normal cooling is possible by
restoring the normal amount of
¥
refrigerant and repairing the leak.
¥
- No discharging of refrigerant.
- Normal cooling is possible by
restoring the normal amount of
¥
refrigerant and repairing the leak.
¥
- Normal discharging of the
refrigerant.
¥
- The capillary tube is faulty.
- Normal discharging of the
refrigerant.
¥
- Cooling operation restarts when
heating the inlet of the capillary ¥
tube.
¥
- Low pressure at high side of
compressor due to low
¥
refrigerant level.
¥
- No pressure in the high
pressure part of the compressor.
¥
¥
Check if oil
leaks.
None or too much
YES
Gas leakage.
(Find the leak and repair it)