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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is a genuine OEM safety control for the AMH80803BXBA gas furnace and compatible Goodman/Amana units. This normally-closed thermal switch opens the control circuit if it senses an over-temperature condition — typically caused by restricted airflow, a dirty filter, or blower failure — shutting the furnace down before damage or a hazard occurs. A tripped or failed auxiliary limit is a common cause of intermittent no-heat lockouts.
The OEM 0130F00038 is calibrated to the exact trip temperature your furnace was designed around — the color code guarantees the correct rating. Generic or mis-rated limits can nuisance-trip or, worse, fail to open when they should. For a safety device, always match OEM.
Easy (1/5) — Disconnect power, unplug the two spade terminals, remove the mounting screws, and install the replacement in the same orientation. About 10 minutes.