Troubleshooting
SiBE12-908
159
Service Diagnosis
Check No.08
Refer to P.171
(R9453)
(
)
1
Continued from
the previous
page
Check No.08
Power supply waveform check
Grounded?
Does LED A turn off?
YES
NO
Check grounding
NO
YES
Carry out grounding work.
The cause seems to be an
external factor other than
failure of the outdoor unit
PCB.
Investigate source of noise
and take measures.
YES
NO
Disturbance?
Turn off the power supply.
Disconnect No. 3 terminal and
turn on the power supply again.
NO
NO
YES
Does LED A
flashing more than
10 times?
Check relay wire between indoor
unit and outdoor unit.
Check wrong wiring, insulation
among wiring, insulation to ground
Is it OK?
YES
Investigate the cause of
disturbance and take
remedial action.
Replace outdoor unit PCB.
Reconnect relay wire.
Replace indoor unit PCB.