DC Inverter U-match Series Cassette Type Unit
36
7 Troubleshooting and Maintenance
7.1 Troubleshooting
If your unit malfunctions or has an operation failure, please first check the
following points before repair:
Table 7.1
Failure Possible
Reasons
The unit cannot be started.
ķ
. The power supply is not connected.
ĸ
. Electrical
short
of
air-conditioning unit causes tripping of the
circuit breaker.
Ĺ
. The operating keys are locked.
ĺ
. The control loop has failed.
The unit operates for a while
and then stops.
ķ
. The condenser air flow is blocked.
ĸ
. The control loop experienced a failure.
Ĺ
. Cooling operation is selected when the outdoor ambient
temperature is above 46.1°C (115
̧
).
Poor cooling effect.
ķ
. The air filter is dirty or blocked.
ĸ
. There is heat source or too many people inside the room.
Ĺ
. The door or window is open.
ĺ
. There is obstacle at the air intake or outlet.
Ļ
. The set temperature is too high.
ļ
. There is refrigerant leakage.
Ľ
. The room sensor has malfunctioned.
Poor heating effect.
ķ
. The air filter is dirty or blocked.
ĸ
. The door or window is not firmly closed.
Ĺ
. The set room temperature is too low.
ĺ
. There is refrigerant leakage.
Ļ
. The outdoor ambient temperature is lower than -5°C (23
̧
).
ļ
. Control
loop
has
failed.
Note:
Once the above listed possible reasons have been eliminated, please turn off the air
conditioner and call for a qualified service technician. Only qualified service techs should repair
the unit.
7.2 Routine Maintenance
Only a qualified service person is allowed to perform maintenance.
Disconnect power supply before servicing the unit.
Do not use hot water above of 50°C (122
̧
) for cleaning air filters and outside
panels.
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