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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM secondary overheat-safety control for the ADSS800403AXAA gas furnace. Mounted on the blower or secondary-limit location, this switch provides an additional layer of protection: if temperatures exceed a safe threshold in its zone, it interrupts the control circuit to stop combustion. The light-blue color designates its specific temperature rating, distinct from the primary high-limit.
OEM vs. Generic: Auxiliary limits must match the furnace's engineered trip temperature exactly. The OEM Goodman light-blue switch ensures the correct set point and reset action. A mismatched aftermarket switch can nuisance-trip in normal operation or fail to open when it should — do not select by color across brands, as coding is manufacturer-specific.
Install Difficulty: Easy (1/3). Turn off power, photograph and transfer the wiring, unscrew, and mount the exact replacement. If this switch tripped, inspect for blower or airflow restriction before restoring heat.