Daikin F-Series Service Manual page 255

Troubleshooting
Check No.10
Refer to P.250
244
Continued from
the previous
page
Does LED A turn off?
YES
Check No. 10
Check the power supply
waveform.
Disturbance?
NO
Turn off the power supply.
Disconnect No. 3 terminal and
turn on the power supply again.
Does LED A
flashing more than 10
times?
YES
Check relay wire between indoor
unit and outdoor unit.
Is it OK?
YES
NO
Check grounding
Grounded?
YES
YES
NO
Check wrong wiring, insulation
(
among wiring, insulation to ground
NO
SiBE12-712C
NO
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.
(R7153)
Service Diagnosis