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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety control for the Goodman/Amana AMS80403AXAC gas furnace. This normally-closed thermal switch opens the ignition circuit if it senses an over-temperature or flame-rollout condition, shutting down the burners to protect the heat exchanger and cabinet. Because it is a manual reset device, it requires a technician to press the reset button after clearing the underlying fault — a deliberate safeguard that flags a real problem rather than silently cycling.
Genuine Goodman limit switches are calibrated to the exact trip temperature the AMS80403AXAC was engineered around. A generic switch with the wrong set point can trip prematurely (nuisance lockouts) or — far worse — fail to trip during a real overheat. On a life-safety component, OEM calibration is not optional.
Easy (2/5) — Two spade terminals and typically two mounting screws. Cut power and gas first, note wire positions, and never bypass a limit switch. If it keeps tripping, diagnose the airflow or rollout cause before returning the furnace to service.