internal fuse blown, located behind control panel, must first remove top vent to expose panel screws. be careful to first unplug unit and there may be a stored charge on capacitor, fuse will be in small holder, is a ceramic cartridge, black or white, 15 or 20 amp which you can find at an Ace hardware, cause of blown fuse, just fatigue bad door interlock alignment, or more severe problem.
bob, April 2007