Daikin FTX25JVEA9 Service Manual page 255

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