DC Inverter Cassette Type Air Conditioner Installation and Operation Manual
69
If your air-conditioning unit suffers from abnormal operation or failure, please first check the following
points before repair:
Failure Possible Reasons
The unit cannot be started.
● The power supply is not connected.
● Electrical leakage of air-conditioning unit causes tripping of
leakage switch.
● The voltage of electrical line is too low.
● The operating keys are locked.
● The control loop has failure.
The unit operates for a while and then
stops.
● There is obstacle in front of the condenser.
● The control loop is abnormal.
● Cooling operation is selected when the outdoor ambient
temperature is above 52
Poor cooling effect.
● The air lter is dirty or blocked.
● There is heat source or too many people inside the room.
● The door or window is open.
● There is obstacle at the air intake or outlet.
● The set temperature is too high thus cooling is hindered.
● There is refrigerant leakage.
● The performance of room temperature sensor becomes worse.
Poor heating effect
● The air lter is dirty or blocked.
● The door or window is not rmly closed.
● The set room temperature is too low thus heating is hindered.
● There is refrigerant leakage.
● The outdoor ambient temperature is lower than -7
℃
.
● Control line is abnormal.
The indoor fan does not start under the
heating mode.
● The installation site of the tube sensor is not proper.
● Tube sensor is not correctly plugged.
● The connecting line of the tube sensor is broken.
● The capacitance has leakage.
Note:
After carrying out the check of the above items and taking relevant measures to solve the problems found
but the air-conditioning unit still does not function well, please stop the operation of the unit immediately and
contact the local service agency .Only ask professional serviceman to check and repair the unit.
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