EdgeStar CWB8420DZ - Troubleshooting the Refrigerant System

9.3 Troubleshooting the Refrigerant System
Once it has been determined that the other systems are working properly, a sealed system
problem can be confirmed using the table when the unit is not cooling or not cooling enough.
No.
Symptom
Cause
Action
1
The evaporator cools down and warms
again.
The condenser warms in proportion as
the evaporator cools.
The process repeats again.
Moisture in the
refrigerant.
Replace the refrigerant.
2
The condenser is cold.
The evaporator is not cold.
The temperature of compressor is high.
Foreign matter
hampers the
cooling.
system.
Locate the troubled
section and make
repairs.
3
No difference in temperature between
suction pipe and discharge pipe of
compressor.
The temperature of compressor is kept
at room temperature.
The evaporator does not cool down.
Failed compressor.
Replace the
compressor.
4
Frost on the suction pipe.
The condenser is overheated.
The refrigeration of evaporator is not
efficient.
The compressor amperage is
higher than normal.
Overcharged.
Discharge the
refrigerant.
Charge refrigerant
to the designated
volume.
Check for leaks.
5
The condenser is cold.
The compressor surface temperature is
high.
The unit is not cold enough.
Low on refrigerant. Find
the leak.
Note:
If you find oil, it is likely
where the leak is.
Discharge the
refrigerant.
Charge refrigerant
to the designated
volume.
Check for leaks.