Troubleshooting - Split Type Indoor Unit Si18-201
242 Service Diagnosis
Troubleshooting
Check No.16
Refer to P.309
Check the voltage of the
transformer's secondary side.
Turn on the power again.
Does the same
LED indication appear
again?
NO
NO
NO
Is it 12 VAC or higher?
Is it normal?
Is it 5 V ± 0.5V?
Check No. 16
Indoor unit PCB (2) output
voltage check
Check the connector
connection between indoor
unit PCBs (1) and (2).
Is the grounding proper?
Check the grounding.
NO
NO
YES
YES
YES
YES
YES
Replace the transformer.
Correct the connector
connection.
Replace the indoor unit PCB (2).
Replace the indoor unit PCB (1).
Provide proper grounding.
The malfunction may be
caused by an external factor,
rather than defective parts.
Locate the cause of the noise,
etc., and correct the situation.
(MF008)
1
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
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