Refrigerating Cycle - LG GB7143**AV Series Service Manual

3. REFRIGERATING CYCLE

Troubleshooting Chart
CAUSE
PARTIAL Freezer room and
LEAKAGE Refrigerator don't
cool normally.
WHOLE Freezer room and
LEAKAGE Refrigerator don't
cool normally.
PARTIAL Freeze room and
CLOG Refrigerator don't
cool normally.
Freezer room and
WHOLE
Refrigerator don't
CLOG
cool.
MOISTURE CLOG Cooling operation
stops periodically.
COMP- Freezer and
RESSION Refrigerator don't
cool.
NO COMP- No compressing
RESSION operation.
Leakage Detection
Observe discharging point of refrigerant which may be in the oil discharging part in the compressor and hole of
evaporator.
Whether Compressor
runs or not.
Frost formed normally
Moisture Clog.
Check Compressor
STATE OF STATE OF THE
THE SET 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 no frost.
Whether frost
YES
forms or not in
Evaporator.
Normal amount
Faulty
Compressor.
Clogged by dust.
TEMPERATURE
OF THE
COMPRESSOR
A little high more
than ambient
temperature.
Equal to ambient
temperature.
A little high more
than ambient
temperature.
Equal to ambient
temperature.
Low than ambient
temperature
A little high than
ambient
temperature.
Equal to ambient
temperature.
No frost or
forms in inlet
only
Observe the discharged
amount of Refrigerant
Inject Refrigerant to Compressor
and check cooling operation.
Frost formed normally
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REMARKS
A little Refrigerant
discharges.
Normal cooling is possible
when injecting of Refrigerant
the regular amount.
No discharging of
Refrigerant.
Normal cooling is possible
when injecting of Refrigerant
the regular amount.
Normal discharging of
refrigerant.
The capillary tube is faulty.
Normal discharging of
Refrigerant.
Cooling operation restarts
when heating the inlet of
capillary tube.
The pressure of high
pressure part in
compressor is low.
No pressure of high
pressure part in the
compressor.
Whether oil leaks or
not.
YES
No or much amount
No or much amount
Gas leakage.
(Check the leakage point)