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Possible causes
Malfunction of I/U fan motor
A Failure of fan motor connector
B Failure of fan motor
C Failure of I/U board
D Failure of cross flow fan shaft
[P12]
(New code)
When AC cord is plugged
in, I/U fan starts rotating.
Check voltage on the motor connector CN210 pin C (GND,
black) and pin E (+V line, yellow) while fan is rotating.
1.0VDC or
higher
Check the fan motor output DC voltage on the I/U board.
Failure of I/U
MCC-1510 board
Below 1.0VDC
Failure of I/U fan
motor
P. C. board
Yellow
Black
(Blue)
(Yellow)
(White)
(Black)
(Red)
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