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YES
NO
Replace
the board.
Turn off the
power supply.
Does the fan
stop in no operating
status?
Control board is defective.
Replace the board.
Start the operation
with low fan setting
in cool operation.
Does the fan rotate?
Change the setting of
cooling to high fan.
Does the fan speed
become higher?
Operation
stops
Normal
Is the DC 35V
measured between
1
(red lead wire) and
2
(black lead wire)
of the motor connector
(CN10) ?
Turn off the power supply.
Does the cross
flow fan rotate
normally?
Repair the
bearing of the
cross flow fan.
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 board.
Turn off the power supply,
and turn it on after
removing the motor from
the board.
Is the voltage of
DC35V measured
between 1 and 2 GND of
the motor connector
(CN10) ?
Replace the
fan motor.
Turn on the
power supply.
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
Item by symptom
Operation
Check Item
Considerable main cause
Measures
(3) Only the indoor fan does not operate