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The Goodman 0130F00038 Auxiliary Limit Switch is a genuine OEM safety component engineered for the WFM18115S5CXCB gas furnace and compatible Goodman/Amana models. Identified by its light-blue housing, this auxiliary high-limit switch continuously monitors heat-exchanger and cabinet temperature, cutting power to the gas valve if the unit overheats — protecting the furnace and your home from unsafe operating conditions.
This is the factory OEM part, calibrated to the exact trip temperature specified by Goodman. Generic aftermarket limit switches are lower cost but often carry looser temperature tolerances and shorter service life. For a safety-critical component, we recommend OEM to preserve correct furnace cycling and warranty compliance.
Easy (1/5). Disconnect power, unplug the two spade terminals, remove the mounting screws, and swap in the new switch. Typically a 10-minute repair. Always shut off gas and electrical power before servicing.