
SiBE04-624_B Troubleshooting
Service Diagnosis 85
2.7 Lights-out of Microcomputer Status Lamp
Error Code No display
Method of Error
Detection
When a microcomputer fault is detected, LED A or LED 5 turns off.
Error Decision
Conditions
Supposed
Causes
Outdoor unit PCB is not power supplied
Power supply failure due to noise
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
(R18137)
Is correct power supplied?
Does the LED A turn off?
Does the LED 5 turn off?
YES
YES
YES
YES
YES
YES
YES
Does the LED A blink?
Does the LED 5 blink?
NO
Is voltage of 5 V
applied between +5V
and GND ?
Restart operation. Restart operation.
NO
NO
NO
NO
NO
NO
Is voltage of 5 V
applied between +5V
and GND ?
Turn on the power supply.
Turn on the breaker.
*Do not work on or touch
components other than
specified part. (Doing so
may cause a short circuit.)
Remove noises.
Replace the outdoor unit
PCB.
Replace the outdoor unit
PCB.
Replace the outdoor unit
PCB.
Remove noises (from the
power supply).
Replace the outdoor unit
PCB.
Remove noises (from the
power supply).
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