Fig. 7.2
8 Troubleshooting and Maintenance
8.1 Troubleshooting
If your air-conditioning unit suffers from abnormal operation or failure, please first check the
following points before contacting your dealer or local service agency:
Failure Possible Reasons
The unit cannot be started
1. The power supply is not connected.
2. Electrical leakage of the unit caused the circuit breaker to
trip.
3. The operating keys are locked.
4. The control loop has a failure.
The unit operates for a
while and then stops
1. There is an obstacle in front of the condenser.
2. The control loop is abnormal.
3. Cooling operation is selected when the outdoor ambient
temperature is above 115°F (46.1°C).
Poor cooling effect
1. The air filter is dirty or blocked.
2. There is a heat source or there are too many people in the
room.
3. The door or window is open.
4. There is blockage at the air intake or outlet.
5. The set temperature is too high.
6. There is refrigerant leakage.
7. The room temperature sensor is malfunctioning.
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 0°F
(-18°C).
6. Control loop is abnormal.
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