Safety first: Turn off the breaker and ensure the fan has stopped completely before working near the blower.

Steps:

Check for obstructions: Remove the front panel and filters. Inspect the cross-flow fan (drum) for debris, ice, or foreign objects. Remove any obstruction carefully.
Spin test: Gently rotate the fan by hand. It should spin freely without grinding or binding. If stiff, check for misaligned end bearings or warped plastic.
Inspect wiring: Locate the indoor fan motor connector on the PCB and ensure it is fully seated. Check the motor harness for damage.
Power test (advanced): With power ON and the unit calling for fan operation, a technician can measure DC voltage to the motor and check for hall sensor feedback. Lack of rotation with correct voltage indicates a failed motor.
Replace fan motor: If the motor is seized or does not run even with proper voltage, replace the indoor DC fan motor assembly specific to your Mitsubishi Electric model.

Indoor unit displays E5, operation stops shortly after starting

Possible Causes