Daikin 2MXS-N Series Service Manual page 132

Troubleshooting for CTXS, FTXS, CDXS, FDXS, FVXS Series
Troubleshooting
Check the power supply
Check No.02
voltage.
Refer to P.167
Turn off the power and
rotate the fan by hand.
Turn on the power and
start operation.
120
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Is the
voltage
NO
fluctuation
within ±10% from
the rated
value?
YES
NO
Does the fan
rotate smoothly?
YES
Turn off the power and
NO disconnect the fan motor
Does the fan
connector, then turn the
rotate?
power on.
YES
Check No.02
Check the output of the
fan motor connector.
Stop the fan motor.
Check No.02
Check the output of the
fan motor connector.
NO
Rotation pulse
generated?
YES
Note: The motor may break when the
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
NO
Rotation pulse
generated?
YES
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).
Service Diagnosis
SiUS121502E
(R20411)