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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is a genuine OEM secondary safety control for the Goodman ADSH801005CXAA gas furnace. Positioned near the blower compartment or burner box, this auxiliary limit provides backup overheat protection alongside the primary limit — opening the control circuit to shut down the furnace if temperatures in its zone climb beyond the safe threshold. The color code (light blue) identifies its specific trip-temperature rating.
Auxiliary limits are color-coded to a precise trip temperature. Installing the wrong rating — easy to do with unmarked generics — either nuisance-trips the furnace or fails to protect it. The genuine light-blue 0130F00038 guarantees the factory-correct set point and terminal layout.
Easy (2/5). Disconnect power, transfer the spade terminals, remove the mounting screws, and install the matching light-blue switch. About 10–15 minutes. Match the color code exactly to the part you remove.