19
Troubleshooting and Maintenance
Troubleshooting
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.
1. The power supply is not connected.
2. Electrical leakage of air-conditioning unit
causes tripping of the leakage switch.
3. The operating keys are locked.
4. The control loop has failure.
The unit operates for a while and then
stops.
1. There is obstacle in front of the condenser.
2. The control loop is abnormal.
3. Cooling operation is selected when the
outdoor ambient temperature is above 52°C.
Poor cooling effect.
1. The air filter is dirty or blocked.
2. There is heat source or too many people
inside the room.
3. The door or window is open.
4. There is obstacle at the air intake or outlet.
5. The set temperature is too high.
6. There is refrigerant leakage.
7. The performance of room temperature
sensor becomes worse
Poor heating effect
1. The air filter is dirty or blocked.
2. The door or window is not firmly closed.
3. The set room temperature is too low .
4. There is refrigerant leakage.
5. The outdoor ambient temperature is lower
than -5°C.
6. Control loop is abnormal.
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.
Table 10
