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The Goodman 20162904 Primary Limit Temperature Control is a genuine OEM high-limit safety switch for the Amana/Goodman AMH80804BXBC gas furnace. Mounted on the heat exchanger vestibule, it opens the burner circuit if supply-air temperature exceeds a safe threshold — protecting the heat exchanger and blower housing from overheating due to restricted airflow, a dirty filter, or a failed blower.
OEM limit controls are calibrated to the exact open/close temperatures and mounting geometry your furnace's control board expects. A generic limit with the wrong trip point can allow overheating or cause premature nuisance shutdowns. Because this is a life-safety component, we recommend the factory OEM part.
Easy to Moderate — two mounting screws and a pair of quick-connect terminals. Cut power at the disconnect before servicing, and confirm airflow issues are resolved so the replacement isn't tripped by the same underlying fault.