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The genuine Goodman 10690402S Interlock Door Switch is the factory blower-door safety switch for the Goodman/Amana ACVC960403BNBA 96% AFUE gas furnace. This normally-open plunger switch closes the line-voltage circuit only when the blower access panel is fully seated, cutting all power to the furnace the instant the door is removed. A failed or stuck door switch is a frequent cause of a furnace that appears completely dead with no display or blower response.
Because this switch carries full line voltage and is a UL safety device, fit and contact rating matter. The OEM 10690402S matches the bracket geometry and plunger travel exactly so the door closes the circuit reliably, while generic switches can misalign with the panel and leave the furnace intermittently dead or unsafe to operate with the door off.
Easy (1/5) — Kill power at the disconnect, unclip the old switch from its bracket, move the two spade leads, and snap the new one in. About 10 minutes with basic hand tools.