Mitsubishi Electric SUZ-SWM30VA TH Series Service Manual page 33

I Check of outdoor fan motor
Disconnect the connectors CN931
and CN932 from the inverter P.C.
board.
Check the connection between the
connector CN931 and CN932.
Is the resistance between each
terminal of outdoor fan motor normal?
(Refer to 12-4.)
No
(Fixed to either 5 or 0 V DC)
Replace the outdoor fan motor.
OCH796A
Yes
Disconnect CN932 from the inverter P.C. board, and turn on the
power supply.
Rotate the outdoor fan motor manually and measure the voltage
of CN931.
Between 1(+) and 5(-)
Between 2(+) and 5(-)
Between 3(+) and 5(-)
Does the voltage between each terminal become 5 and 0V
No DC repeatedly?
Does the outdoor fan motor rotate smoothly?
No
33
Yes
Yes
Replace the inverter P.C. board.