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The Goodman 0130F00035 Primary Limit Switch is a genuine OEM safety control designed for the WFM18045S3AXCB modular blower furnace and compatible Goodman/Amana gas furnace platforms. Identified by its purple housing, this primary high-limit protects the heat exchanger by cutting power to the burners if supply-air temperature climbs above the factory cutout point — preventing dangerous overheating and cracked heat exchangers.
OEM vs. Generic: The genuine OEM 0130F00035 is calibrated to Goodman's exact cutout temperature, ensuring the furnace cycles correctly and stays within warranty. Generic limit switches often trip at the wrong temperature, causing nuisance shutdowns or, worse, failing to open when needed. For a safety-critical control, OEM is strongly recommended.
Install difficulty: Easy — typically two mounting screws and two spade connectors. Always shut off power and gas before servicing. Most DIYers can complete this in under 15 minutes.