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The Goodman 10690402S is a genuine OEM interlock (blower door) safety switch for the VCSS960402BNAA gas furnace and compatible Goodman/Amana models. This plunger-style switch cuts power to the furnace whenever the blower access panel is removed, preventing the unit from operating with the door open. A failed or stuck door switch is a common reason a furnace appears completely dead with no lights or ignition.
The OEM 10690402S matches the exact plunger length and bracket footprint so the panel actuates the switch reliably. Generic switches with a slightly different plunger travel can fail to close, leaving the furnace dead, or fail to open, defeating the safety interlock. OEM fit is critical here.
Rated Easy (1/5). Disconnect power, unplug the two wire terminals, remove the mounting screws, and snap in the new switch. Confirm the door depresses the plunger fully. About 10–15 minutes.
Never bypass or tape down a door interlock switch — it is a required safety device.