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The Goodman 10690402S Interlock Door Switch is the genuine OEM blower-compartment safety switch for the AMVS960603BUAA variable-speed gas furnace. This normally-open plunger switch de-energizes the furnace when the blower access door is removed, protecting technicians and homeowners from live electrical and moving-blower hazards. A worn or stuck door switch is a common cause of a furnace that won't start.
As a UL safety component, the OEM switch is the recommended replacement — it matches the factory contact rating, plunger travel, and mounting bracket. Generic switches may not seat correctly against the door and can fail to break the circuit, defeating the safety interlock.
Moderate (2/5) — Requires powering down the furnace at the disconnect, unclipping the bracket, and transferring two wire leads. 10–15 minutes for a DIYer comfortable with basic wiring; otherwise call a technician.