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The Goodman 10123529 Manual Reset Limit Switch is the genuine OEM high-limit safety control for AMH80804BNBC furnaces. This normally-closed thermal switch opens the ignition/gas circuit if the burner or heat-exchanger area exceeds its safe temperature threshold, then requires a manual push-button reset — an intentional design that forces a technician to inspect the furnace before it can re-fire. It guards against overheating from blocked airflow, blower failure, or flame rollout.
This genuine OEM switch is calibrated to your furnace's exact trip and reset temperatures. Generic limits may open too early (nuisance lockouts) or too late (a real safety risk). On a life-safety control, factory calibration matters — always choose OEM.
Moderate (2/5). Power down the furnace, remove the mounting screws, transfer the two spade terminals, and mount the new switch in the same orientation. Straightforward, but because it is a combustion safety device, confirm proper operation and have a qualified technician diagnose why the original tripped before returning the unit to service.