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The 10123529 is a genuine OEM manual-reset high-limit / flame-rollout safety switch for the Amana/Goodman AMVC800805CNAB two-stage, variable-speed 80% AFUE gas furnace. This normally-closed control opens the ignition circuit if it senses excessive temperature or flame rollout, shutting the furnace down to prevent heat-exchanger damage and fire. Because it is a manual reset device, a tripped switch must be physically reset — and the root cause (blocked venting, dirty burners, restricted airflow, or a cracked heat exchanger) must be diagnosed before restoring operation.
The OEM switch is calibrated to the exact trip temperature and mounting footprint this furnace requires. A generic switch with the wrong set-point can nuisance-trip or, worse, fail to trip — defeating a life-safety function. For any combustion safety control, OEM is strongly recommended.
Moderate (2/5). Power off the furnace, note the wiring, remove the two spade terminals and mounting screws, and install the replacement. Wiring is simple, but the underlying overheat/rollout condition must be corrected. When in doubt, use a licensed HVAC technician.
Goodman and Amana share one OEM parts catalog; 10123529 is a direct fit for the Amana AMVC8 furnace.