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The Goodman 0130F00036 is the color-coded pink primary high-limit switch for the WFD18115S5CXCB furnace and compatible models. Goodman uses the pink color code to identify this switch's specific trip temperature. It is a normally-closed thermal safety that opens and cuts the gas valve if the heat-exchanger area exceeds its rated limit — protecting against a failed blower, blocked filter, or restricted ductwork.
Limit switches are matched to the furnace by trip temperature, and the pink code exists specifically so you install the right one. The OEM Goodman switch guarantees the correct set point and mounting flange. A generic switch with the wrong temperature can either nuisance-trip or fail to protect the furnace — never substitute by color alone; match the OEM part number.
Easy. Two mounting screws and two spade terminals. Cut power first, transfer the wires, and reinstall. A 10-minute repair for a confident DIYer.