Daikin FTKM-U Series Service Manual page 64

Troubleshooting
Troubleshooting
Turn off the power supply.
(Unplug the power cable or turn
the breaker off.)
Check the connector for
connection.
Check No. 03
Check the fan motor for
breakdown or short circuit.
Check No. 03
Check the motor control voltage.
Check No. 03
Check the indoor unit PCB for
rotation pulse.
Reference
Check No.03 Refer to P.91
Note(s)
The rotation pulse is the feedback signal from the indoor fan motor.
60
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
OK?
YES
Foreign matters in or
around the fan?
NO
Rotate the fan by hand.
Fan rotates smoothly?
YES
Resistance OK?
YES
Turn the power on again.
Is the motor control
voltage 15 VDC
generated?
YES
Is the rotation pulse
generated?
YES
Note: The motor may break when the
motor connector is disconnected
with the power supply on.
(Turn off the power supply before
connecting the connector also.)
∗ To secure the connection,
once disconnect the connector
and then reconnect it.
NO
YES
NO
Abnormal
sound occurs?
YES
Is the rubber cushion
properly fitted?
NO
NO
NO
NO
SiMX042215E
Correct the connection.
Remove the foreign matters.
NO
YES
Replace the bearing rubber
cushion.
Correct the position of
rubber cushion or replace
the rubber cushion.
Replace the indoor fan motor.
Replace the indoor unit PCB
(control PCB).
Replace the indoor fan motor.
Replace the indoor unit PCB
(control PCB).
Part 6 Service Diagnosis
R6000288