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

Troubleshooting

2.38 Lights-out of Microcomputer Status Lamp

Remote —
Controller Display
Method of When a microcomputer fault is detected, LED A turns off.
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Troubleshooting
167
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
Does the LED A blink?
YES
NO
*For the unit with standby power
save function, first set the ON
timer using remote controller to
release the standby power save
function.
NO
NO
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.)
Replace outdoor unit PCB.
Replace outdoor unit PCB.
Replace outdoor unit PCB.
Remove noises (from the
power supply).
(R9458)
Service Diagnosis