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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM secondary safety control for the Goodman/Amana ADVC80805CXAA 80% AFUE gas furnace and compatible models. The auxiliary limit provides a second layer of over-temperature protection — often mounted near the blower compartment — cutting the burners if heat builds where the primary limit can't sense it. The light-blue color code identifies its specific temperature trip rating.
Like the primary limit, the light-blue code sets an exact trip temperature. A mismatched generic switch can bypass the furnace's layered safety design. Use the OEM color-coded part to keep the auxiliary protection working exactly as engineered.
Rating: Easy (2/5). Turn off power, unscrew the switch from its bracket, move the wire terminals to the new unit, and remount. Match the light-blue color code and confirm normal furnace cycling after the repair.