Daikin FTX-N Series Service Manual page 135

SiUS091601EA
Troubleshooting
FTX18/24UVJU, FVXS Series
Part 6 Service Diagnosis
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
voltage
NO
fluctuation
within ±10% from
the rated
value?
YES
Turn off the power and
rotate the fan by hand.
NO
Does the fan
rotate smoothly?
YES
Turn on the power and
start operation.
Turn off the power and
NO disconnect the fan motor
Does the fan
connector, then turn the
rotate?
power on.
YES
Stop the fan motor.
Check No.02
Check the output of the
fan motor connector.
Indoor fan
NO
motor rotation pulse
generated?
YES
Note: The motor may break when the
Check No.02
Check the output of the
fan motor connector.
Motor
NO
power supply
voltage 310 ~ 340
VDC?
YES
Motor
NO
control voltage 15
VDC generated?
YES
Rotation
NO
command voltage
1 ~ 6.5 VDC?
YES
Indoor fan
NO
motor rotation pulse
generated?
YES
Troubleshooting for FTX, FVXS Series
Correct the power
supply.
Replace the indoor
fan motor.
motor connector is disconnected
while the power is turned on.
(Be sure to turn off the power
before reconnecting the
connector.)
Replace the indoor
unit PCB (control
PCB).
Replace the indoor
unit PCB (control
PCB).
Replace the indoor
unit PCB (control
PCB).
Replace the indoor
fan motor.
Replace the indoor
unit PCB (control
PCB).
Replace the indoor
fan motor.
Replace the indoor
unit PCB (control
PCB).
(R22444)
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