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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue cap) is a genuine OEM secondary thermal safety for VMSS960603BNAA gas furnaces and compatible Goodman/Amana equipment. Mounted on the blower deck or auxiliary limit bracket, this normally-closed switch adds a second layer of over-temperature protection beyond the primary limit, opening the control circuit if heat backs up into the blower compartment due to airflow loss. The color-coded light-blue housing identifies its specific trip rating within the Goodman limit family.
OEM vs. Generic: Goodman color-codes these auxiliary limits to an exact cutout temperature, so matching the light-blue OEM part guarantees the correct trip point and bracket fit. Substituting a mismatched or universal limit can defeat the intended protection or cause nuisance shutdowns. For a color-specific safety switch, always match OEM.
Installation difficulty: Easy (1/5). Disconnect furnace power, remove the two mounting screws, transfer the two spade terminals, and reinstall — roughly a 10-minute job. Confirm the replacement's color code matches the original before installing.