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The Goodman 0130F00038 Auxiliary Limit Switch (identified by its light-blue body) is a genuine OEM safety control for the Amana/Goodman AMVC80805CXBD 80% AFUE gas furnace. Auxiliary limit switches provide a secondary layer of over-temperature protection at a specific location in the furnace cabinet — such as near the blower deck or burner box — supplementing the primary high-limit. The light-blue color coding identifies its calibrated trip temperature, so it is critical to replace it with the matching OEM part rather than a differently rated switch.
OEM vs. Generic: Limit switches are color-coded by temperature for a reason. The genuine Goodman 0130F00038 opens and closes at the exact thresholds engineered for this furnace and mounts to the factory location. A generic snap-disc with a different rating can cause nuisance shutdowns or, worse, fail to trip when it should. For a safety device, always match the OEM part and its color code.
Install difficulty: Easy (1/5). Disconnect furnace power, pull the spade terminals, remove the mounting screws, and install the new switch in the same orientation. A 10–15 minute swap for most DIYers, but recurring trips should be diagnosed by a qualified HVAC technician.