6-5 REFRIGERATION CYCLE
Troubleshooting Chart
STATE OF
CAUSE
THE UNIT
PARTIAL
Freezer
LEAKAGE
compartment and
Refrigerator don't
cool normally.
COMPLETE Freezer
LEAKAGE
compartment and
Refrigerator don't
cool normally.
PARTIAL
Freezer
CLOG
compartment and
Refrigerator don't
cool normally.
WHOLE
Freezer
CLOG
compartment and
Refrigerator don't cool. formed.
MOISTURE
Cooling operation
CLOG
stops periodically.
COMP-
Freezer and
RESSION
Refrigerator
don't cool.
NO COMP-
No compressing
RESSION
operation.
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
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
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
- 15 -
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)