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The genuine Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a factory OEM safety control for Amana / Goodman AMH80604BNBC gas furnaces. This normally-closed thermal switch monitors temperature at a secondary location — such as the blower compartment or near the heat exchanger — and opens the circuit to shut down heating if it senses an overheat condition, often caused by a dirty filter, blocked airflow, or blower failure. It is a required safety component that protects the furnace and home from excessive heat.
The color coding on limit switches indicates its specific trip temperature — using the correct OEM 0130F00038 (light blue) guarantees the right cutout point. A mismatched generic switch with the wrong temperature rating can nuisance-trip or, worse, fail to protect. For a safety device, always match OEM specification exactly.
Easy. Usually two mounting screws and two spade connectors. Shut off power, note wire positions, and swap. About 10–20 minutes for most DIYers.