Daikin FTX50GV1B Service Manual page 76

Troubleshooting
Troubleshooting
Check No.11
Refer to P.94
Check the indoor unit - outdoor
unit connection wires.
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.
Check the LED A on the outdoor
unit PCB.
65
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Check the power supply voltage.
Is the Is the
voltage fluctuation voltage fluctuation
within ±10% from the within ±10% from the
rated value? rated value?
YES
Is there any wiring error?
NO
Properly insulated?
NO
Is LED A blinking?
YES
Rotate the
outdoor fan by hand.
Does the outdoor fan rotate
smoothly?
YES
Check No.11
Check the power supply
waveform.
Is there any disturbance?
YES
NO
YES
YES
NO
NO
NO
SiBE041029EB
Correct the power supply.
Correct the indoor unit -
outdoor unit connection wires.
Replace the connection wires
between the indoor unit and
outdoor unit.
Diagnose the outdoor unit
PCB.
Replace the outdoor fan
motor and the outdoor unit
PCB.
Replace the indoor unit PCB.
Locate the cause of the
disturbance of the power
supply waveform, and correct
it.
(R19525)
Service Diagnosis