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The Goodman 0130F00038 is a genuine OEM auxiliary limit switch — identified by its light-blue cap — for the WFD195090S5DAA gas furnace and compatible Goodman/Amana models. This normally-closed thermal safety switch monitors temperature in the blower or burner area and opens the circuit if the furnace overheats, shutting down heating to prevent damage and fire risk. A tripped or failed auxiliary limit is a frequent cause of a furnace that blows only cool air or locks out on a safety code.
Limit switches are calibrated to a specific trip temperature — the color code exists for exactly that reason. Installing a generic switch with the wrong setpoint can nuisance-trip in normal operation or, worse, fail to trip when it should. The OEM 0130F00038 guarantees the factory-specified temperature rating and terminal layout, so the furnace's safety chain works as designed.
Easy (1.5/5). About 15 minutes. Disconnect power, note the wire positions, remove the two mounting screws, transfer the spade terminals, and secure the new switch. Match the light-blue color code exactly — do not substitute a different-temperature switch.