My Englander 55-shp22 combustion motor is humming and it smells like the windings are burning. This happens when the stove is completely shut down and cold. I have to unplug the stove to stop it. When I start the stove up it seems like the motor is running like it should and I don't smell anything. When unplugged, the fan does turn so it's not bound up. Any help would be appreciated.