Troubleshooting And Maintenance; Troubleshooting - Air-Con ASKEC4H4R18 Installation Manual

7 Troubleshooting and Maintenance

7.1 Troubleshooting

If your air-conditioning unit suffers from abnormal operation or failure, please first check the
following points before repair:
Failure
The unit cannot be started.
The unit operates for a
while and then stops.
Poor cooling effect.
Poor heating effect
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 AIR-CON. Only ask professional
serviceman to check and repair the unit.
DC Inverter U-match Series Cassette Type Unit
Table 13
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.
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.
The air filter is dirty or blocked.
① .
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
The air filter is dirty or blocked.
① .
The door or window is not firmly closed.
② .
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.
30
Possible Reasons