Refrigerating Cycle - LG GA-B409U*QA Service Manual

5. REFRIGERATING CYCLE
Troubleshooting Chart
CAUSE
PARTIAL
LEAKAGE
WHOLE
LEAKAGE
PARTIAL
CLOG
WHOLE
CLOG
MOISTURE
CLOG
COMP-
RESSION
NO COMP-
RESSION
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.
STATE OF
THE SET
Freezer room and Low flowing sound of Refrigerant
Refrigerator don't cool is heard and frost forms in inlet
normally. only.
Freezer room and Flowing sound of Refrigerant is
Refrigerator don't cool not heard and frost isn't formed.
normally.
Freeze room and Flowing sound of Refrigerant is
Refrigerator don't cool heard and frost forms in inlet
normally. only.
Freezer room and Flowing sound of Refrigerant is
Refrigerator don't not heard and frost isn't formed.
cool.
Cooling operation Flowing sound of Refrigerant is
stops periodically. not heard and frost melts.
Freezer and Low flowing sound of Refrigerant
Refrigerator don't is heard and frost forms in inlet
cool. only.
No compressing Flowing sound of Refrigerant is
operation. not heard and no frost.
Whether frost
YES
forms or not in
Evaporator .
Normal amount
Faulty
Compressor.
Check Compressor
STATE OF THE
EVAPORATOR
No frost
or forms
in inlet only
Inject Refrigerant to Compressor
and check cooling operation.
Clogged by dust.
-16-
TEMPERATURE
OF THE
COMPRESSOR
A little high more than
• A little Refrigerant discharges.
ambient temperature.
• Normal cooling is possible
when injecting of Refrigerant
the regular amount.
Equal to ambient
• No discharging of Refrigerant.
temperature.
• Normal cooling is possible
when injecting of Refrigerant
the regular amount.
A little high more than
• Normal discharging of
ambient temperature.
refrigerant.
• The capillary tube is faulty.
Equal to ambient
• Normal discharging of
temperature.
Refrigerant.
Low than ambient
• Cooling operation restarts
temperature.
when heating the inlet of
capillary tube.
A little high than
• The pressure of high pressure
ambient temperature.
part in compressor is low.
Equal to ambient
• No pressure of high pressure
temperature.
part in the compressor.
Whether oil
leaks or not.
Observe the discharged
amount of Refrigerant.
No or much amount
(Check the leakage point)
Frost formed normally
REMARKS
YES
Gas leakage.