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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM secondary safety control for the Goodman ACVC80803BXBD gas furnace and compatible Goodman/Amana models. The auxiliary limit provides backup overheat protection in a specific area of the furnace cabinet — such as the blower compartment or near the heat exchanger — opening to de-energize the gas valve if temperatures exceed safe limits. The light blue color identifies its factory-set trip-temperature rating, distinct from the primary (pink) high limit.
Color coding matters: the light blue rating must match the position and temperature Goodman specified for this furnace. A mismatched or generic auxiliary limit can nuisance-trip or fail to protect. Because this is a safety device, install only the exact OEM part with the correct color code.
Easy — Disconnect power, remove the spade terminals and mounting screws, and install the new switch in the same location and orientation. Simple replacement; always diagnose why an auxiliary limit tripped before resetting the system.