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The Goodman 10690402S Interlock Door Switch is a genuine OEM blower-compartment door safety switch for the Amana/Goodman AMES960403BUAA gas furnace. This normally-open plunger switch cuts power to the furnace whenever the blower access panel is removed, preventing the unit from running with the door open. If the switch fails, the furnace won't start at all — no ignition, no blower — because the control board never sees a closed door circuit.
OEM vs. Generic: The 10690402S matches the exact plunger length, mounting tabs, and electrical rating of the original. Aftermarket door switches often have the wrong actuation depth, so the door either can't close the circuit or the switch is crushed on install. For a reliable, direct-fit repair, the OEM switch is the right call.
Install Difficulty: Easy to Moderate. Disconnect power, unplug the two spade terminals, unclip or unscrew the old switch, and mount the new one in the same bracket. Confirm the door plunger depresses fully when the panel is installed. About 15 minutes.
Always disconnect power before servicing. Never bypass a door interlock switch — it is a required safety device.