Mitsubishi Electric · MSZ-AP Air Conditioners
The indoor unit's upper lamp blinks three times, indicating a problem with the indoor fan motor. The system is not receiving the rotational frequency feedback signal during the fan's operation.
Click steps to track your progress.
Turn off the air conditioner at the main power supply breaker.
Carefully open the indoor unit's front panel and check if the indoor fan is visibly obstructed by any foreign objects.
Remove any obstructions if it is safe to do so and the power is off.
Ensure the fan blades can spin freely by hand (when power is off).
Close the panel, wait 30 seconds, then turn the main power supply back on.