temperature in the lower zone is
lower than the set temperature.
3. Is the isolation between the upper zone and lower zone not good?
For models - Dual zone with two doors
The displayed temperature is
higher than the set temperature.
1. Is the ambient temperature too high more than 35°C?
2. Is he ventilation blocked?
3. Is the fan motors failed?
4. Is the temperature sensor failed?
5. Is the cooling system failed? If the temperature of one zone is
normal and the second zone is abnormal, check the solenoid
valve.
The displayed temperature is
lower than the set temperature.
1. Is the ambient temperature lower than the set temperature? This
is normal.
8.3 TROUBLE CHECK FOR REFRIGERANT SYSTEM
Once it has been determined that the other electrical systems are working properly, a probable
sealed system problem can be confirmed according to the below table when the unit is no cool or
not cold 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 causes the
malfunction.
Replace the refrigerant.
2 The condenser is cold.
The evaporator is not cold.
The temperature of compressor is high.
Foreign substances
hamper 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 level.
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 electric current of compressor is
much larger than normal.
Overcharge. Discharge the
refrigerant.
Charge refrigerant
to the designated
volume.
Check for gas leak.
5 The condenser is cold.
The compressor surface temperature is
high.
The refrigeration is not cold enough.
Short of refrigerant. Find
the leaking position.
NOTE:
Note:
If you can find oil on
somewhere, it is
possible where the
leakage point is.
Discharge the
refrigerant.
Charge refrigerant
to the designated
volume.
Check for gas leak.
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