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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety control for AMS80604BXAA 80% AFUE furnaces and compatible Goodman/Amana models. This normally-closed thermal switch opens the ignition circuit if it senses excessive heat or flame rollout, shutting the furnace down to prevent damage or fire. Because it is a manual-reset design, it must be physically reset with the button after a trip — a repeated trip signals an underlying airflow or combustion problem that should be diagnosed.
The OEM Goodman switch is calibrated to the exact trip temperature specified for this heat exchanger, so it protects the furnace without nuisance tripping. Generic limit switches may carry a similar rating but can differ in trip point and terminal orientation. For a safety-critical component, the OEM part is the recommended choice.
Easy. The switch mounts with two screws and uses spade (quick-connect) terminals. Shut off power and gas, note wire positions, and swap in the new switch. Estimated time: 15–20 minutes. Do not bypass a tripping limit switch — resolve the root cause.