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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety control for the AMH80803BXBA gas furnace and compatible Goodman/Amana models. This normally-closed thermal switch opens and cuts power to the gas valve if it senses abnormal heat — such as a flame rollout or blocked heat exchanger — and requires a manual push-button reset once the fault is cleared, ensuring an unsafe condition is investigated rather than auto-cycled.
The OEM 10123529 is calibrated to Goodman's exact trip temperature. Generic switches with the wrong setpoint may nuisance-trip or, worse, fail to protect the heat exchanger. Because this is a life-safety component, OEM is strongly recommended.
Easy (2/5) — Two mounting screws and two spade terminals. Disconnect power, note wire positions, and never bypass or jumper a tripped limit. If it keeps tripping, diagnose the root cause (airflow, rollout) before returning the furnace to service.