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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is the OEM secondary thermal cutoff for VCES800603AXAA gas furnaces. It backs up the primary high limit, opening the circuit to shut the furnace down on an overheat condition in the blower or cabinet area. The light-blue color code marks its specific factory trip temperature, which differs from the primary limit — so the two are not interchangeable.
Because the auxiliary limit protects against a different overheat scenario than the primary, its trip point is unique. Substituting a generic or wrong-color switch defeats the layered safety design. Always confirm both the 0130F00038 part number and the light-blue code before installing.
Easy — two screws and two spade terminals, roughly 15 minutes with power and gas off. If it tripped, correct the underlying airflow or blower fault before restoring operation.