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SiBE12-933_A
Troubleshooting
Service Diagnosis
211
Check No.10
Refer to P.217
(R7153)
(
)
(1)
Continued from
the previous
page
Check No. 10
Check the power supply
waveform.
Grounded?
Does LED A turn off?
Disturbance?
YES
NO
Check grounding
NO
YES
YES
NO
YES
Turn off the power supply.
Disconnect No. 3 terminal and
turn on the power supply again.
Does LED A
flashing more than
10 times?
Check relay wire between indoor
unit and outdoor unit.
Is it OK?
YES
NO
NO
Check wrong wiring, insulation
among wiring, insulation to ground
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.
Investigate the cause of
disturbance and take
remedial action.
Replace outdoor unit PCB.
Reconnect relay wire.
Replace indoor unit PCB.