– 50 –
9-3-7. Only the Indoor Fan does not Operate
< Check procedure >
YES
NO
Does the fan stop in
no operating status?
Control P.C. board is defective.
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.
Operation
stops
Shut off the power supply.
Motor control circuit failure
(IC30, IC03) or 12V power
circuit failire (D03, Q03).
Thermal fuse operated
due to prevent
temperature rising cause
of incompleted connecting.
Does the cross flow
fan rotate normally?
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)
Turn on the power supply.
Repair the
bearing of
the fan.
NO
YES
YES
NO
NO
YES
YES
YES
NO
Turn the power supply.
Shut off the power
supply once.
NO NO
Does connecting
terminal, connecting
cable or power supply
cord completely?
Does not found the short
wire about connecting
cable and power cord?
Does the fan speed
become higher?
Replace connecting the
cable (or power cord),
thermal fuse and
terminal block.
Replace the P.C. board.
Replace the
fan motor
Replace the P.C. board.
Normal
YES
Replace the control
P.C. board.
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