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YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World!
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Troubleshooting and Maintenance
Troubleshooting
If your air-conditioning unit is experiencing abnormal operation, or a system failure, please follow these steps before repair:
Failure
Possible Causes
The unit will not start
1. The power supply is not connected.
2. Electrical leakage of air-conditioning unit causes tripping of the breaker.
3. The operating keys are locked on the remote or wall mount controller.
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
118°F (48°C).
Poor cooling performance
1. Air filter is dirty or obstructed
2. There is heat source or too many people in the room.
3. A 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 a refrigerant leakage.
7.
The room temperature sensor is malfunctioning.
Poor heating performance
1. Air filter is dirty or obstructed
2. Doors or windows in the room are not closed
3. The set room temperature is too low.
4. There is a refrigerant leakage.
5. The outdoor ambient temperature is lower than -5°F.
6.
Control loop is abnormal.
Note:
After checking the list of above items, and taking steps to solve the issue, if the air conditioning system is still not running
normally, or functioning well, please stop the operation of the unit immediately and contact a local HVAC service
technician. A qualified HVAC technician will be required to diagnose and service the system.