III - 21
Service Procedures
3
SM830063
1-6. Procedures when a specific component does not work at all
(1) Check the indoor unit (When the alarm of transmission failure is not activated)
¶ In case that the unit is controlled by Flexible Combination, an electronic control valve failure has occurred or one
of the units cannot be controlled due to electronic control valve circuit failure, and other units do not operate
normally either. Due to this, try to detect the troubled unit and correct it.
1. Troubleshooting
Normal
No
Failure in the electronic
control valve activation.
No
Replace the sensor.
Operate the unit in
cooling mode.
(30 minutes after its operation)
• Cooled air comes out.
• Is the temperature of each indoor coil sensor almost
the same? (Refer to the sensor temperature
display function of the remote controller.)
• Does each indoor coil sensor detect the temperature
correctly? (Is there any leakage from the pipe of the
temperature detection section?)
Yes
Yes
0460_M_I
(2) Compressor motor is not running at all.
No
Yes
Is compressor motor magnetic
contactor (52C) normal ?
Replace the compressor
motor magnetic contactor.
Check resistance of compressor
motor winding.
Replace the compressor.
NG
0461_M_I
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