Midea MCD-18HRFN1-QRC4 Service Manual page 125

Troubleshooting
2.4.1.5. Indoor fan speed has been out of control.
Index 1:
1.Indoor DC fan motor(control chip is inside fan motor)
Measure the resistance value of each winding by using the tester. If any resistance value is zero, the fan
motor must have problems and need to be replaced.
For other models:
Electrical Control System 131