Mitsubishi Electric Mr. SLIM MSZ-FA25VA Technical Manual página 442

Resolución de averías
• Fan motor does not operate or stops operating shortly after starting the operation.
G Check of outdoor fan motor
Check the connection between the
connector CN931 and CN932.
Is the resistance between each terminal
of outdoor fan motor normal?
No
(Fixed to either 5V or 0V DC)
Replace the outdoor DC fan motor.
442
Yes
Disconnect CN932 from outdoor electronic control 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 (-)
No
Does the voltage between each terminal become 5V DC and 0V DC
repeatedly?
No
Does the outdoor fan motor rotates smoothly?
Replace the outdoor electronic control P.C. board.
Yes
Yes