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Instructions of Unit Installation
Troubleshooting and Maintenance
If your air-conditioning unit suffers from abnormal operation or failure, please first check the
following points before repair:
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
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 FIHSER. Only ask professional
serviceman to check and repair the unit.
Routine Maintenance
Cleaning the Air Filter(Operating by the professional)
（1） Do not disassemble the air filter when cleaning it. Otherwise failure may be caused
（2） If the air-conditioning unit is used in an environment with much dust, you should clean the air
filter frequently (once every two weeks).
Caution: You shall pay attention to the following matters when cleaning the
air-conditioning unit.
1) Cut off all power supply before contacting the line connecting equipment.
2) Only clean the air-conditioning unit after the unit is shut off and the power supply is
disconnected. Otherwise electrical shock or injury may be caused.
3) Do not use water to clean the air-conditioning unit. Otherwise there may be electrical shock.
Failure
Possible Reasons
1.
The power supply is not connected.
2.
Electrical leakage of air-conditioning unit
causes tripping of 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 43℃.
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 thus cooling
is hindered.
6.
There is refrigerant leakage.
7.
The performance of room temperature
sensor becomes worse
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 thus
heating is hindered.
4.
There is refrigerant leakage.
5.
The outdoor ambient temperature is lower
than -5℃.
6.
Control line is abnormal.
3８
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