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The Goodman 0130F00038 Auxiliary Limit Switch is a genuine OEM safety control engineered for the Amana/Goodman AMVC800805CXAA 80% AFUE two-stage variable-speed gas furnace. This normally-closed thermal switch (identified by its light-blue housing) monitors heat exchanger and burner-area temperatures, opening the circuit to shut down the gas valve if an over-temperature or flame-rollout condition occurs — a critical protection against unsafe operation.
This is the factory OEM part, guaranteeing the exact trip temperature and terminal configuration specified by the furnace manufacturer. Generic aftermarket limit switches may carry different calibration tolerances; for a UL-listed safety component we strongly recommend OEM to preserve the furnace's certified safety response.
Easy (2/5). Disconnect power, unplug the two spade terminals, remove the mounting screw, and swap. Most DIY-capable owners complete this in under 15 minutes. Always cut power at the disconnect before servicing and verify correct seating against the heat exchanger.