Daikin 4MXL-T Series Service Manual page 189

SiUS121827E
Troubleshooting
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
fluctuation within
±10% from the rated
value?
YES
Turn off the power supply.
(Unplug the power cable or turn
the breaker off.)
Check the connector for
connection.
OK?
YES
Foreign matters in or
around the fan?
NO
Rotate the fan by hand.
Does the fan
rotate smoothly?
YES
Turn on the power on again and
start operation.
Check No.02
Check the output of the fan motor
connector.
Motor power
supply voltage 290 ~ 330
VDC or more?
YES
Motor control
voltage 15 VDC
generated?
YES
Rotation
command
voltage 0 ~ 2 VDC
when stopped, 2 ~ 5 VDC
when operated
YES
NO
NO
YES
NO
Note: The motor may break when the
motor connector is disconnected
while the power is turned on.
(Be sure to turn off the power
before reconnecting the
connector.)
NO
NO
NO
Troubleshooting for SA Indoor Unit
Correct the power
supply.
Correct the
connection.
Remove the foreign
matters.
Replace the indoor
fan motor.
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.
(R24054)
183