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The Goodman 20162904 Primary Limit Temperature Control is the genuine OEM high-limit safety switch for the AMEC960803BNAA gas furnace and compatible Goodman/Amana models. Mounted on the heat exchanger or blower deck, this normally-closed thermal switch monitors supply-air temperature and cuts power to the gas valve if the furnace overheats — the primary protection against heat-exchanger damage and fire. A furnace that short-cycles on high heat, will not fire, or trips repeatedly often has a failed primary limit.
OEM vs. Generic: The OEM 20162904 ships with Goodman's exact trip and reset temperatures, mounting bracket, and terminal orientation. Generic limits with a different set point can nuisance-trip or, worse, fail to trip at the correct temperature — a genuine safety concern. For a safety-critical control we strongly recommend the OEM part.
Install difficulty: Moderate (2/5). Disconnect furnace power, note and photograph the wiring, remove the two mounting screws, transfer the spade connectors to the new limit, and re-secure. Basic hand tools required; verify normal cycling after reassembly.