DC Inverter Duct Type Unit
32
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 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 filter 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 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 -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
SHARP
. Only
ask
professional serviceman to check and repair the unit.
8.2 Routine Maintenance
Only a qualified 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 filters and outside panels.
Note:
① .
Do not operate the air conditioner with the filter uninstalled, otherwise dust would come into
the unit.
② .
Do not remove the air filter except for cleaning. Unnecessary handling may damage the filter.
③ .
Do not clean the unit with gasolene, benzene, thinner, polishing powder or liquid insecticide,
