Troubleshooting The Refrigerant System - EdgeStar CWB8420DZ Service Manual

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.
1 The evaporator cools down and warms
again.
The condenser warms in proportion as
the evaporator cools.
The process repeats again.
2 The condenser is cold.
The evaporator is not cold.
The temperature of compressor is high.
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.
4 Frost on the suction pipe.
The condenser is overheated.
The refrigeration of evaporator is not
efficient.
The compressor amperage is
higher than normal.
5 The condenser is cold.
The compressor surface temperature is
high.
The unit is not cold enough.
Symptom Cause
Moisture in the
refrigerant.
Foreign matter
hampers the
cooling.
system.
Failed compressor.
Overcharged.
Low on refrigerant. Find
the leak.
Note:
If you find oil, it is likely
where the leak is.
Action
Replace the refrigerant.
Locate the troubled
section and make
repairs.
Replace the
compressor.
Discharge the
refrigerant.
Charge refrigerant
to the designated
volume.
Check for leaks.
Discharge the
refrigerant.
Charge refrigerant
to the designated
volume.
Check for leaks.