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The Goodman/Amana 0130F00038 Auxiliary Limit Switch (light-blue body) is a genuine OEM secondary safety control for the AMH80805CXBD gas furnace and related Goodman and Amana models. It backs up the primary limit by opening the gas circuit if a specific zone of the furnace exceeds its safe temperature, guarding against restricted airflow or a failed blower.
The blue color code identifies a precise trip temperature. Installing the wrong-rated switch defeats the safety design. The OEM 0130F00038 guarantees the exact setpoint your furnace was engineered around—never substitute by appearance alone.
Easy (1/5). Two screws, two spade terminals. Kill power and gas, swap, and restore. Roughly 15 minutes with basic hand tools.