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The Goodman 0130F00035 Primary Limit Switch (purple-coded) is a genuine OEM high-temperature safety control for the WFD18045S3AXCC gas furnace and compatible Goodman/Amana models. Mounted on the heat-exchanger/plenum area, the primary limit opens and cuts the gas valve if supply-air temperature climbs past its rated trip point — protecting the heat exchanger from overheating due to a dirty filter, blocked ductwork, or blower failure. A limit that trips early or won't reset causes intermittent no-heat and nuisance shutdowns.
The genuine OEM Goodman switch is factory-calibrated to the exact trip temperature for this furnace, matched by its purple color code. Substituting a generic limit with the wrong set-point can cause premature tripping or, worse, fail to protect the heat exchanger. The color-matched OEM part guarantees correct calibration.
Easy–Moderate (2.5/5). About 20–30 minutes. Cut power at the disconnect, remove two mounting screws, transfer the wire leads to the identical terminals, and confirm the correct purple part number. Match color and part number exactly — do not guess on a safety control.
Genuine OEM, in stock, with a fit guarantee for the WFD18045S3AXCC.