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The Goodman 0130F00036 Limit Switch (Pink) is a genuine OEM thermal safety control for the WFD18090S4BXCB gas furnace. Color-coded pink to indicate its factory temperature rating, this high-limit switch monitors heat-exchanger temperature and opens the circuit to shut off the burners if the furnace overheats — protecting the heat exchanger and preventing a fire hazard from restricted airflow or blower failure.
Limit switches are calibrated to a precise trip temperature — that's what the pink color code identifies. Installing a generic switch with the wrong rating can allow dangerous overheating or cause nuisance shutdowns. Always match the OEM 0130F00036 by part number and color code; do not substitute a differently rated switch.
Easy (1 of 5). Cut power, remove two mounting screws, transfer the wire terminals, and mount the new switch on the heat-exchanger panel in the same orientation. Confirm the furnace cycles normally on a call for heat afterward.