DC Inverter U-match Series Cassette Type Unit
30
7 Troubleshooting and Maintenance
7.1 Troubleshooting
If your air-conditioning unit suffers from abnormal operation or failure, please rst check the
following points before repair:
Table 13
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 48°C.
Poor cooling effect.
① .
The air lter 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 lter is dirty or blocked.
② .
The door or window is not rmly 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.
Note: After carrying out the check of the above items and taking relevant measures to solve the
problems but the air-conditioning unit still does not function well, please stop the operation of the
unit immediately and contact the local service agency designated by Gree. Only ask professional
serviceman to check and repair the unit.
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