Faulty Indoor Unit Pcb - Daikin FTK25JVE9 Service Manual

Trouble shooting
5.5

Faulty Indoor Unit PCB

∗
Remote
Controller
Display
Indoor unit LED
Display
Method of The proper program operation of the microcomputer is checked by the program.
Malfunction
Detection
Malfunction When the microcomputer program does not function properly.
Decision
Conditions
"
Supposed
Causes
"
Troubleshooting
70
Microcomputer program 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.
Dose it reappear?
NO
Check the grounding. (earth)
Is the grounding proper?
YES
YES
NO
Si04-115
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.
(R1948)
Service Diagnosis