Indoor Unit Pcb Abnormality - Daikin FT25CV1A Service Manual

Troubleshooting
4.6

Indoor Unit PCB Abnormality

∗
Remote
Controller
Display
Method of The proper programme operation of the microcomputer is checked by the programme.
Malfunction
Detection
Malfunction When the microcomputer programme does not function properly.
Decision
Conditions
Supposed
Causes
Troubleshooting
94
Microcomputer programme is in abnormal condition due to an external factor.
*Noise
*Momentary voltage drop.
*Momentary power failure, etc.
Faulty indoor unit PCB.
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Turn on the power again.
Does the same
LED indication appear
again?
YES
Check the grounding. (earth)
Is the grounding proper?
YES
NO
NO
Si01-406
Replace the indoor unit
PCB.
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.
(R1881)
Service Diagnosis