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The Goodman 10123529 is a genuine OEM manual reset limit switch built for the AMVC80805DXBC 80% two-stage gas furnace. This bimetal safety control opens the ignition circuit if it senses excessive temperature — typically from a blocked flue, failed blower, or flame rollout — and must be reset by hand once the fault is cleared. That manual-reset action is a deliberate safety feature: it forces a technician to find the root cause rather than let the furnace short-cycle on a fault.
The OEM 10123529 is factory-calibrated to the exact trip temperature this furnace's heat exchanger requires. Generic switches with the wrong setpoint either nuisance-trip or, worse, fail to protect against overheating. Because this is a safety device, we strongly recommend the genuine OEM part.
Rating: Easy (2/5). Remove power, disconnect the two spade terminals, unscrew the switch from its bracket, and mount the replacement. Do not bypass or jumper a tripped limit — if the new switch trips, diagnose airflow and combustion before running the furnace.