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The Goodman 0130F00035 Primary Limit Switch (identified by its purple color code) is a genuine OEM high-temperature safety control for the WFD18070S3AXCC furnace. Mounted on the heat exchanger or burner area, it opens the control circuit if the furnace overheats — protecting the heat exchanger from cracking and preventing a fire hazard. A failed or nuisance-tripping primary limit is a leading cause of a furnace that fires briefly and then shuts down, or won't run at all.
Limit switches are trip-temperature specific, and the color code exists precisely so the correct cutout point is installed. A generic switch with the wrong trip temp will either nuisance-trip and short cycle, or fail to protect the heat exchanger at all. This OEM 0130F00035 is factory-calibrated to the WFD18070S3AXCC's exact limit spec — the safe, correct choice.
Roughly 20–30 minutes. Cut power at the disconnect, note the two wire positions, remove the mounting screws, and transfer the wires to the new switch. Because it is a life-safety device, verify orientation and firm heat-exchanger contact. If you're unsure, have an HVAC technician confirm the installation.