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The genuine OEM Goodman/Amana 20162903 Primary Limit Switch is a 150°F high-limit safety control for AMES960603BNAA gas furnaces and compatible Goodman/Amana models. Mounted on the heat exchanger/blower deck, it monitors supply-air temperature and cuts the gas valve if the furnace overheats — typically from a dirty filter, blocked airflow, or a failed blower.
The 150°F set point and mounting flange geometry are model-specific. A generic limit with the wrong trip temperature causes short-cycling or overheating. This OEM 20162903 delivers the exact calibrated set point and drop-in flange fit Goodman engineered for your furnace.
Moderate (2/5). Disconnect power, remove the two mounting screws, transfer the spade connectors, and reinstall the new switch. Always correct the root airflow issue that tripped the original limit before returning the furnace to service.