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The 0130F00038 Auxiliary Limit Switch is a genuine OEM high-temperature safety control for the Goodman/Amana AMVC800804CXAA gas furnace. Identified by its light-blue body, this normally-closed thermal switch opens to cut power to the gas valve if it senses an overheat condition — typically caused by restricted airflow such as a dirty filter or failed blower. It is a critical safety component that prevents heat-exchanger damage and fire hazards.
Limit switches are calibrated to a specific trip temperature — the light-blue OEM code guarantees the exact factory set point. Substituting a generic switch with a different rating can either nuisance-trip or, worse, fail to protect the furnace. Always match the color/part number.
Easy to Moderate — Power off, remove two screws and the spade connectors, and replace in the same location and orientation. Verify the correct trip rating before installing.