Mitsubishi Electric MXZ-2C30VA Service Manual page 91

• 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
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 5V or 0V DC)
Replace the outdoor fan motor.
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 5V DC and 0V DC
repeatedly?
No
Does the outdoor fan motor rotate smoothly?
Replace the outdoor electronic control P.C. board.
91
MXZ-2C
Outdoor electronic control
Inverter P.C. board
P.C. board
(-)
(-)
(-)
Yes
Yes
MXZ-3C/4C/5C