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The Goodman 10690402S is the OEM blower-door interlock safety switch for the Amana AMES920803BNAA gas furnace. This plunger-style switch de-energizes the furnace whenever the blower access panel is removed, preventing the unit from running with the door off — a code-required safety that also stops the furnace from drawing air (and combustion products) from the equipment room. A stuck, broken, or misaligned door switch is a classic reason a furnace goes completely dead: no lights, no blower, no ignition even though power is present.
The genuine OEM 10690402S has the exact plunger length and bracket geometry so the door actuates it reliably every time. Generic door switches often sit at the wrong depth, causing intermittent no-starts that are frustrating to diagnose. OEM is the safe choice; a tested generic equivalent is available at a lower price for experienced installers.
Easy — DIY-friendly (15–20 min). Disconnect power, remove the mounting screw(s), transfer the two wires to the new switch, and confirm the blower door depresses the plunger fully when closed. A quick continuity check verifies operation before you button it up.