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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue body) is a genuine OEM thermal safety control for the Amana/Goodman AMSS920805CNAA gas furnace. This normally-closed switch opens on excessive temperature — typically from restricted airflow, a dirty filter, or a failed blower — cutting power to the gas valve to prevent heat-exchanger damage and overheating.
The OEM switch is calibrated to the exact trip and reset temperatures the furnace was engineered around — the light-blue code identifies that rating. A generic switch with a different set point can cause premature trips (no heat) or, worse, let the furnace run too hot. Match the OEM color and part number for correct, safe operation.
Easy — DIY friendly (about 10 minutes). Disconnect power, remove two mounting screws, transfer the two spade wires, and install the replacement. Confirm the temperature code matches before powering back up.