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The Goodman 20162903 primary high-limit switch is a factory overheat safety control for the ACSH960905DXAA gas furnace. Mounted on the heat exchanger / supply plenum, it opens at approximately 150°F to shut off the burners if airflow is restricted (dirty filter, failed blower, blocked ducts), preventing heat-exchanger damage and unsafe operation.
OEM Goodman limit switches match the exact 150°F trip temperature, insertion depth, and mounting flange of the original. Generic switches with the wrong setpoint can short-cycle the furnace or fail to protect the heat exchanger. For a safety control, always use the OEM-rated part.
Easy — typically a two-screw flange mount with spade terminals. Cut power before servicing, confirm continuity with a meter, and verify the furnace cycles normally after replacement.