Faulty Indoor Unit Pcb - Daikin FTK25JV1NB Manual

Si-86.book Page 63 Friday, June 23, 2000 10:26 AM
SIE-86
5.7

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
Service Diagnosis
Microcomputer program is in abnormal condition due to an external factor.
∗Noise.
∗Momentary voltage drop.
∗Momentary power failure, etc.

Faulty indoor unit PCB.

Turn on the power again.
Does the same
NO
LED indication appear
again?
YES
Check the grounding. (earth)
NO
Is the grounding proper?
YES
Troubleshooting
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.
(MF004)
63