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The Goodman B1370819 Blower Door Safety Switch is a genuine OEM interlock control for ADS80904BXA gas furnaces and compatible Goodman/Amana models. This normally-open switch cuts power to the furnace whenever the blower compartment door is removed, preventing the unit from operating with the cabinet open. A failed or missing door switch is one of the most common reasons a furnace won't start.
This factory-original Goodman part drops into the existing mounting location with the correct plunger length and contact rating. Generic substitutes often have a different actuator height or bracket, leading to a switch that won't close fully — meaning the furnace still won't run even with the door on.
Easy — two wire terminals and one or two mounting screws inside the blower compartment. Shut off power at the disconnect before opening the cabinet.