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The Goodman 20162903 Primary Limit Switch is a genuine OEM 150°F high-temperature safety control for the Goodman GKS90905DXAD gas furnace. Mounted on the heat exchanger or blower housing, this normally-closed switch opens the circuit if supply-air temperature exceeds its 150°F trip point, shutting down the burners to prevent overheating. A failed or nuisance-tripping limit switch is a common cause of short-cycling, no-heat calls, and the furnace running the blower without ignition.
Limit switches are calibrated to a specific temperature and mounting footprint. The OEM 20162903 matches Goodman's exact 150°F rating and bracket pattern, so it seats correctly and protects the heat exchanger as designed. Generic universal limits with the wrong trip point or reach can allow dangerous overheating or cause false trips — OEM is the safe choice for this safety-critical part.
Easy to Moderate — disconnect power, remove two mounting screws, transfer the wire terminals, and reinstall. Verify the trip temperature stamped on the old switch matches before installing.