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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue body) is a genuine OEM secondary high-limit safety control for the AMH80804BXBB gas furnace. It provides backup overheat protection — typically guarding the blower compartment or a secondary heat zone — and opens the control circuit to stop the furnace if temperatures exceed the safe threshold, complementing the primary limit.
The light-blue color code identifies this switch's specific trip temperature — matching it exactly is critical. The genuine 0130F00038 is factory-calibrated to Goodman's spec, so it protects without nuisance tripping. Generic substitutes with the wrong temperature stamp compromise either safety or reliability, so OEM is the recommended choice.
Easy (1/5). Two screws and two spade connectors. Cut power before servicing and confirm the replacement carries the same light-blue temperature code. If it had tripped, diagnose the airflow or blower issue behind the overheat before restarting the furnace.