Daikin FTX25JVEA9 Service Manual page 250

Si18-201
1.5.5 Faulty Indoor Unit PCB
∗
Remote
Controller
Display
Indoor Unit LED A
Display
Note: No LED Display on FTK(X)25/35J Series.
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
B ∗
4
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.
Does the same
LED indication appear
again?
YES
Check the grounding. (earth)
Is the grounding proper?
YES
Troubleshooting - Split Type Indoor Unit
NO
NO
Replace the outdoor 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.
(MF005)
237