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The Goodman 10123529 is a genuine OEM manual reset high-limit / rollout safety switch for the AMH80805CNBC gas furnace and compatible Goodman/Amana models. This normally-closed thermal switch opens the control circuit if it senses excessive temperature or flame rollout, shutting the furnace down to prevent damage or a fire hazard. Once tripped, it must be manually reset with the button — a repeatedly tripping switch usually signals restricted airflow or a heat-exchanger issue that should be inspected.
Because this is a safety device, the genuine Goodman OEM switch is calibrated to the furnace's exact trip temperature. Generic switches with incorrect setpoints can nuisance-trip or, worse, fail to protect the unit. For safety components, always use the OEM part.
Moderate (2/5). Disconnect power, unplug the two spade terminals, remove the mounting screws, and install the new switch in the same orientation. A basic multimeter helps confirm continuity.