Three speed motor. How do you switch fan speeds from heat to ac to see if the motor has a bad motor spot.?
I'm not sure what you mean by a bad motor spot. You can normally check this by switching the Auto/On fan switch while the unit is running in the heating mode. You should be able to hear the fan speed change while doing this. Normally your fan is set to low speed for heating and high speed for cooling but this is not always the case. Many times the installer will set the unit to run in high speed all the time. Good luck!
