Mitsubishi Electric MXZ-2C30VA Service Manual page 106

• Fan motor does not operate or stops operating shortly after starting the operation.
Check of outdoor fan motor
MXZ-2C30/2C40/2C52/3C54/3C68/4C71/4C80/5C100VA
MXZ-4C80/5C100VA2
Disconnect CN932 and measure the
resistance of the outdoor fan motor.
Is the resistance of outdoor fan motor
normal? (Refer to 11-5.)
No
(Fixed to either 5 V or 0 VDC)
Replace the outdoor fan motor.
OBH584G
CN931
CN932
Yes
Turn ON the power supply.
Rotate the outdoor fan motor manually and measure the voltage of
CN931.
Between (+) and
Between (+) and
Between (+) and
No
Does the voltage between each terminal become 5 VDC and 0 VDC
repeatedly?
No
Does the outdoor fan motor rotate smoothly?
Replace the inverter P.C. board/electronic control
P.C. board.
106
MXZ-2C
Electronic control P.C.
Inverter P.C. board
board
(-)
(-)
(-)
Yes
Yes
MXZ-3C/4C/5C