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The Goodman 20162903 is the genuine OEM primary high-limit switch used in the ACES961005CNAA gas furnace and many related Goodman/Amana models. This normally-closed thermal safety control mounts to the heat-exchanger plenum and monitors supply-air temperature. If airflow is lost or the furnace overheats, the switch opens at approximately 150°F and shuts off the gas valve and burners to protect the heat exchanger and your home.
The OEM 20162903 is calibrated to the exact trip temperature engineered for this furnace, ensuring the burners cut out at the correct point. Generic snap-discs may carry a similar rating but can vary in calibration, mounting bracket, and lead style — leading to nuisance trips or improper protection. For a safety-critical control, OEM is strongly recommended.
Easy (1/5). Disconnect power, remove the two mounting screws, transfer the spade connectors, and reinstall. Most experienced DIYers complete this in under 15 minutes. Always cut power at the breaker before servicing and verify correct operation after replacement.