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The Goodman 0130F00038 Auxiliary Limit Switch is a genuine OEM temperature-sensing safety control engineered as a direct-fit replacement for the WGFM28115V5CXAA gas furnace. Identified by its light-blue housing, this auxiliary limit interrupts the burner circuit if internal cabinet temperatures exceed safe operating limits, protecting the heat exchanger and blower assembly from overheating.
OEM vs. Generic: The genuine Goodman switch is calibrated to the exact trip temperature specified for your furnace's heat exchanger. Generic aftermarket limits may carry a nearby setpoint but can trip early (nuisance shutdowns) or late (safety risk). For a safety-critical component we recommend the OEM part to preserve factory certification and reliable operation.
Install difficulty: Easy (1/5). Shut off power and gas, unplug the two spade connectors, remove the mounting screws, and swap in the new switch. Typically a 10-minute repair for a technician; homeowners comfortable working around 120V and gas equipment can complete it with basic hand tools. Verify the burner sequence after replacement.