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The Goodman 0130F00035 is the genuine OEM primary high-limit switch (purple) for the WFM18045S3AXCC furnace and compatible Goodman/Amana models. This safety control monitors heat-exchanger temperature and shuts off the gas valve if the furnace overheats — protecting the unit and your home from a cracked heat exchanger or fire hazard. The purple color code identifies its specific trip temperature.
Limit switches are temperature-calibrated safety devices — the purple OEM part is set to the exact factory trip point for this furnace. A generic switch with the wrong trip temperature can allow dangerous overheating or cause nuisance trips. For any safety control, always match the OEM color code and part number.
Moderate — Two mounting screws and two spade terminals, but correct placement on the heat exchanger is critical. Professional installation recommended for safety controls.