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The Goodman 20162903 Primary Limit Switch is a genuine OEM 150°F auto-reset temperature control for Goodman and Amana AMSS960804CNAA gas furnaces. Mounted on the heat-exchanger bulkhead, the primary limit continuously watches supply-air temperature and opens the circuit to shut off the burners if the furnace overheats — the classic symptom of a dirty filter, closed registers, a failing blower, or restricted ductwork. Once the cabinet cools below the setpoint, this auto-reset switch closes again and allows normal operation to resume.
The trip temperature and disc response curve are matched to this furnace's heat-exchanger geometry. A generic 150°F limit with a different sensing profile can short-cycle the burners or allow the cabinet to run hotter than the design intends. The genuine 20162903 is spec'd to the unit, so heating cycles stay smooth and safe.
Easy (2/5) — Kill power at the furnace, note the wire positions, remove the two mounting screws, transfer the terminals to the new switch, and remount in the identical location and orientation. Replace the filter and confirm proper airflow so the new limit is not immediately overworked.
Ships from stock. OEM fit guaranteed.