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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is a genuine OEM safety control designed for the Amana/Goodman AMH80805CXBB gas furnace. This normally-closed thermal switch monitors temperature at a secondary location in the furnace cabinet and opens the circuit to shut off the burners if it detects an overheat condition — protecting the heat exchanger and blower components from heat damage.
The light-blue color code designates a precise trip and reset temperature. Installing the wrong rating — common with generic substitutes — can cause nuisance trips or, worse, fail to protect against overheating. OEM guarantees the exact factory temperature calibration for safe operation.
Easy (1/5). Typically two mounting screws and two spade connectors. Shut off power and gas first, note wire positions, and confirm the replacement's color code matches the original before installing.