FILE NO. SVM-12050
–
71
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(3) Only the indoor motor fan does not operate
<Primary check>
1. Is it possible to detect the power supply voltage (AC220–240V) between
Q
and
R
on the terminal block?
2. Does the indoor fan motor operate in cooling operation?
(In heating operation, the indoor fan motor does not operate for approximately 10 minutes after it is turned
on, to prevent a cold air from blowing in.)
Replace the fan motor.
YES
NO
NO
YES
YES
NO
NO
YES
YES
YES
NO
NO
NO
YES
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 120 V
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
(IC31, Q301) or 12 V
Switching power supply failure.
Does the cross flow
fan rotate normally?
Is the rotation signal (DC+5 V
−
0 V)
output between
2
(gray lead wire)
and
3
(brown lead wire) of the motor
connector (CN33) when rotating the
cross flow fan by hand in no operating
status? (1 pulse/one turn)
Turn on the power supply.
Repair the
bearing of
the fan.
Turn the power supply.
Shut off the
power supply once.
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 P.C. board.
Normal
Replace the control
P.C. board.
