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The Goodman 20162903 is a genuine OEM primary high-limit switch rated to trip at 150°F, designed for the Amana/Goodman AMH80804BNAA gas furnace and related models. This normally-closed thermal safety control monitors heat-exchanger and plenum temperature and cuts power to the gas valve if the furnace overheats — protecting the heat exchanger from cracking and preventing unsafe operation.
The genuine Goodman limit switch is calibrated to the precise trip point specified for this furnace's airflow and heat-exchanger design. Aftermarket switches with a mismatched temperature rating will nuisance-trip on normal heating cycles or, worse, fail to open when they should. Because this is a life-safety control, OEM calibration matters.
Easy (2/5) — Cut power, unplug the two spade terminals, remove the mounting screws, and swap in the new switch. No specialty tools needed. Confirm the furnace cycles and satisfies without tripping after replacement.