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The Goodman 0130F00038 Auxiliary Limit Switch is a genuine OEM thermal safety control engineered for the WGFM28090V5CXAB gas furnace and compatible Goodman/Amana models. This normally-closed limit switch monitors heat-exchanger and cabinet temperatures, opening the circuit to shut down the burners if the furnace overheats — protecting your equipment and home from unsafe operating conditions.
The light-blue housing identifies the factory trip-temperature rating for this application. When an auxiliary limit fails, you may notice short-cycling, no heat, or a furnace that locks out on a limit fault, making this an inexpensive but critical repair part.
OEM vs. Generic: This genuine OEM switch is calibrated to the exact factory trip temperature and mounting footprint. Aftermarket generics may have looser tolerances or slightly different bracket geometry — for a safety control, we recommend the OEM part to preserve the furnace's certified operating envelope.
Install difficulty: Easy (1/5). A basic repair for most DIYers — disconnect power, unplug the two spade terminals, remove two mounting screws, and install the replacement. Always cut power at the breaker before servicing. Typical job time is under 15 minutes.