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Multi Variable Air Conditioners Compact Cassette Type Indoor Unit
8 Troubleshooting
The air conditioner is not expected to be serviced by users. Incorrect repair may cause electric
shock or fire, so please contact an authorized service center for professional service. The following
checks prior to contact may save your time and money.
Phenomenon
The unit can't start
The unit stops after running for a
while
Poor cooling effect
Poor heating effect
Indoor fan doesn't start
up during heating
If air conditioner still fails to work normally after checking and handling as
described above, please stop using it immediately and contact local service center for assistance.
① Power supply is not connected.
② Circuit breaker tripping caused by leakage of electricity.
③ Input voltage is too low.
④ Operation button is off.
⑤ Error of control loop.
① There is obstacle in front of condenser.
② Error of control loop.
③ Perform cooling when outdoor ambient temperature is higher than 43 ℃
( 109 ℉ ).
① The filter is dirty or blocked.
② Too heavy heat load of room (e.g. too many people).
③ Door or windows is open.
④ Air inlet and outlet of IDU are blocked.
⑤ Set temperature is too high or refrigerant leaks.
⑥ The performance of room temperature sensor gets worse.
① The filter is dirty or blocked.
② Door or window is open.
③ Set temperature is too low.
④ Refrigerant leaks.
⑤ Outdoor ambient temperature is lower than -5 ℃ (23 ℉ ).
⑥ Error of control circuit.
① Position of tube temperature sensor is improper.
② Tube temperature sensor is not inserted well.
③ Wiring of tube temperature sensor breaks off.
④ Electrical leakage of capacitor.
22
Troubleshooting
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