My buddy has a PelPro accutron. Recently the exhaust fans has been cutting out which in turn has been backing up the burn pot and filling the house with smoke. It seems that the fan will run for 20-26 hours before it will cut out again and back up the burn pot and smoke out the house. I did a deep clean on the stove pulling out the fans and trying to ensure that it is not plugged. Is there a high temp switch that can cause this? Any help would be appreciated.