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The Goodman 0130F00036 Primary Limit Switch (identified by its pink body) is a genuine OEM safety control for the Goodman GDH80403AXBB gas furnace. This high-limit switch monitors heat-exchanger temperature and cuts power to the burners if the furnace overheats — protecting the equipment and home from unsafe temperatures caused by restricted airflow, dirty filters, or blower failure.
Limit switches are calibrated to a specific trip temperature. This genuine Goodman OEM switch is factory-set to the exact rating for the GDH80403AXBB — the color code (pink) denotes that calibration. Substituting a generic switch with the wrong trip point can cause nuisance shutoffs or, worse, fail to protect against overheating. Always match the OEM color and part number.
Easy — Two mounting screws and two spade connectors. De-energize the furnace, note wire positions, and swap. Verify the correct color-coded replacement before ordering.