Tosot TU18H3O, Owner'S Manual

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DC Inverter U-match Series Cassette Type Unit
39
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:
Table 7.1
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 46.1°C (115
℉ ).
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
(23
℉
).
6
Control loop is abnormal.
NOTICE:
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
TOSOT . Only ask professional serviceman to check and repair the unit.