DC Inverter U-match Series Duct Type Unit
32
8 Troubleshooting and Maintenance
8.1 Troubleshooting
If your air-conditioning unit suffers from abnormal operation or failure, please rst 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 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.
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 designated by Gree. Only ask
professional serviceman to check and repair the unit.
8.2 Routine Maintenance
Only a qualied service person is allowed to perform maintenance.
Before accessing to terminal devices, all power supply circuits must be disconnected.
Do not use water or air of 50°C or higher for cleaning air lters and outside panels.
Note:
① .
Do not operate the air conditioner with the lter uninstalled, otherwise dust would come into
the unit.
② .
Do not remove the air lter except for cleaning. Unnecessary handling may damage the lter.
③ .
Do not clean the unit with gasolene, benzene, thinner, polishing powder or liquid insecticide,
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