I am having trouble with the fan in my Thelin Gnome pellet stove. The fan runs when the selector switch is switched to the clean position, but when in high, medium or low is seems to be running very slow. I was wondering if the brushes may need to be replaced or do I need to replace the fan motor. Also how would i know if it is a Pittman or ExMec motor, or are the interchangeable.
Any help in this matter would be greatly appreciated. Thank you.