Lights-Out Of Microcomputer Status Lamp - Daikin CTXU25G2V1B Service Manual

Troubleshooting
2.38

Lights-out of Microcomputer Status Lamp

Remote —
Controller Display
Outdoor Unit LED A1
Display
Method of When a microcomputer fault is detected, LED A or LED 5 turns off.
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Troubleshooting
160
51 ( - )
Outdoor unit PCB is not power supplied
Power supply failure due to noise
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Is correct power supplied?
YES
Is LED A turned off?
YES
Is voltage of 5 V
applied between +5V
and GND ?
YES
Restart
Dose the LED A blink?
YES
NO
*For the machine with stand-by
power save function, first set the
ON timer using remote
controller to release the stand-
by power save function.
NO
Is LED 5 turned off?
NO
YES
Is voltage of 5 V
applied between +5V
and GND ?
YES
Restart
NO
Dose the LED 5 blink?
YES
SiBE12-908
Turn on power supply.
Turn on breaker.
*Do not work on or touch
components other than
specified part. (Doing so
may cause a short circuit.)
NO
Remove noises.
NO
Replace outdoor unit PCB.
Replace outdoor unit PCB.
NO
Replace outdoor unit PCB.
Remove noises (from the
power supply).
Replace outdoor unit PCB.
Remove noises (from the
power supply).
(R9458)
Service Diagnosis