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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)
Turn OFF the breaker.
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
Turn it ON 10 seconds
after.
Start cooling with LOW
fan speed.
Change fan speed to HH.
Stop operation and turn OFF
breaker. Disconnect CN210,
turn ON breaker again, and
then stop operation using R/C.
Stop operation and unplug
AC cord. Disconnect
CN210, plug in AC cable
again, and then stop
operation using R/C.
Fan motor is normal.
Does fan stop with
operation OFF?
Does cross flow fan
rotate normally by hand?
Does fan speed
increase?
Does fan rotate?
Is min.1VDC present
between CN210 pin
E and C ?
Is min. 280VDC present
between CN210 pin
A and C ?
Is min. 280VDC present
between CN210 pin
D
and
C
?
Is min. 15VDC present
between CN210 pin
D and C with
motor connected?
Operate I/U (except
heating) by R/C. Is min.
1VDC present between
CN210 pin
E
and
C
?(Measure within
15 seconds.)
Rotate the fan by hand with
operation OFF. Is 0 to
15VDC (rev return signal)
generated between CN210
pin
F
and
C
?
Operate I/U (except
heating) by R/C. Is min.
1VDC present between
CN210 pin
E
and
C
? (Measure within
15 seconds.)
Replace I/U fan
motor.
Replace I/U MCC-
1510 board.
Repair cross flow
fan shaft.
Troubleshooting (Continued)
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