Service manual

Troubleshooting SiBE05-722_C
70 Service Diagnosis
Troubleshooting
Check No.11
Refer to P.97
Check No.11
Check the power supply
waveform.
Check the voltage of the
connection wires on the indoor
terminal board between No. 1
and No. 3, and between No. 2
and No. 3.
YES
YES
NO
NO
YES
NO
Caution
Correct the indoor unit -
outdoor unit connection wires.
Diagnose the outdoor unit
PCB.
Replace the connection wires
between the indoor unit and
outdoor unit.
Is LED A blinking?
Properly insulated?
YES
Replace the indoor unit PCB.
Locate the cause of the
disturbance of the power
supply waveform, and correct
it.
(R18283)
NO
YES
NO
Replace both the fan motor
and the outdoor unit PCB.
Rotate the
outdoor fan by hand.
Does the outdoor fan rotate
smoothly?
Is there any disturbance?
Is there any wiring error?
Check the indoor unit - outdoor
unit connection wires.
Check the LED A on the outdoor
unit PCB.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
NO
YES
Check the power supply voltage.
Correct the power supply.
Voltage as rated?