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9-3-6. Only the Indoor Fan does not Operate
< Check procedure >
YES
NO
Shut off the power
supply once.
Does the fan
stop in no operating
status?
Control P.C. board is defective.
Replace the P.C. board.
Start the operation
with low fan setting
in cool operation.
Does AC 120V
or higher voltage apply
to between red and black
lead of fan motor?
Does the fan rotate?
Change the setting of
cooling to high fan.
Does the fan speed
become higher?
Operation stops
Normal
Shut off the power supply.
Does the cross
flow fan rotate
normally?
Turn on the power supply.
Is the rotation signal
(DC+5V-0V) output between
4
(blue lead wire) and
2 (black
lead wire) of the motor connector
(CN10) when rotating the cross
flow fan by hand in no operating
status ? (2 pulses/one turn)
Replace the control
P.C. board.
Replace the P.C. board.
Motor control circuit failure
(IC30, IC03)or 12V Power
circuit or Thermal fuse in
fan motor failure.
Replace the fan motor.
Repair the bearing of
the drain fan.
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
Turn the power supply.
*
Be sure to disconnect the motor connector CN10 after shut off the power supply, or it will be a cause of
damage of the motor.
40


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