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The Goodman 20162904 is a factory-original primary limit temperature control engineered as a direct fit for the AMH80804BXBD 80% AFUE gas furnace and compatible Goodman/Amana models. This high-limit safety switch continuously monitors heat-exchanger and plenum temperature, opening the control circuit to shut down the burners if the furnace overheats due to restricted airflow, a dirty filter, or blower failure. It is the primary safety device that protects your heat exchanger from thermal damage and prevents unsafe operating conditions.
This is a genuine OEM Goodman component with the exact trip temperature and mounting geometry specified for your furnace. Generic or universal limit switches often carry a different trip point or bracket, which can cause nuisance lockouts or, worse, fail to protect the heat exchanger. Choosing the factory part guarantees calibrated protection and preserves your equipment warranty.
Rating: Easy–Moderate (2/5). Replacement typically takes 15–25 minutes for a handy homeowner: shut off power and gas, remove the two mounting screws, transfer the wire leads, and reinstall. Always cut power at the disconnect before servicing. If your furnace is repeatedly tripping the limit, diagnose the airflow cause—do not simply reset it.