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Trouble Shooting
Trouble Shooting
Problem
Cause
Trouble Shooting/ Remedy
The power supply is turned OFF.
Turn the power supply ON.
The fuse in the PCB is gone or blown.
Replace fuse.
Running at low (model 75/100)
Switch to high mode
Reverse rotation (model 125/150)
Swtich the phase for power line
The set temperature is higher than room
temperature
Lower the set temperature.
The room temperature is excessively low for cooling
Can not operate as it is out of temperature
control range.
a Phase protector open (condensing unit)
refer to page 28
b High pressure switch open
Check if any
i. air blockage on outdoor unit.
ii outdoor fan motor malfunction
iii. refrigernat overcharge.
iv. outdoor ambient above operating limit.
Check if any
i. refrigerant gas leakage
c Low pressure switch open
d comp overload protector open
The unit is just started the cooling mode
Wait for a while
High infiltration through door, windows
Close the door ,windows
Low refrigerant level
check suction, discharge pressure and temperature
Air flow too high
Change fan speed
Drain pipe is cloagged, water overflow
Clear the drain pipe
Cooling , but not cold enough
Water discharge from
the unit
Unit cannot operate
In case of malfunction, perform the following preliminary check , before asking for repair service.
Air flow too small
At Cooling Mode, no
cold air is delivered
Check if any
i. refrigernat overcharge.