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The Goodman 10690402S Interlock Door Switch is a genuine OEM blower-door safety switch for the AMEC960804CNAB gas furnace and compatible Goodman/Amana models. This normally-open plunger switch is depressed when the blower access panel is in place, completing the 24V/line circuit that allows the furnace to run. When the door is removed for service, the switch opens and de-energizes the furnace—a required safety feature that prevents operation with the panel off. A failed door switch is a frequent cause of a furnace that won't start at all.
The genuine 10690402S matches the exact plunger length and bracket geometry so the switch actuates correctly when the panel seats. Generic switches may not engage properly, leaving the furnace dead or, worse, defeating the safety interlock. OEM ensures proper fit and function.
Difficulty: Easy. Cut power, unclip the bracket, transfer the two wire terminals, and reinstall. A straightforward repair for a handy homeowner; verify the plunger seats fully when the door is closed.