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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue identifier) is a genuine OEM secondary safety control for the Goodman ACSS920402BNAA gas furnace and compatible models. This auxiliary limit provides a second layer of over-temperature protection beyond the primary limit, opening the control circuit to shut down heating if abnormal temperatures are detected in the blower or cabinet area. The light-blue color code identifies its specific trip rating — always match the color when replacing.
The color-coded trip temperature on this switch is matched to Goodman's furnace design. Installing a generic switch — or the wrong color — can result in nuisance trips or inadequate protection. The genuine 0130F00038 guarantees the correct factory setpoint.
Easy. Typically a 10–20 minute job: cut power, disconnect the spade terminals, unbolt the switch, and install the replacement. Verify the light-blue rating matches your old part before installing. Shut off power and gas before servicing.