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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is a genuine OEM high-temperature safety cutout for the Goodman WFM18070S3AXCC furnace and compatible models. This normally-closed thermal switch opens to shut down the burner if the cabinet or blower compartment exceeds a safe temperature, protecting against overheating from restricted airflow or blower failure.
A tripped or failed auxiliary limit is a frequent cause of no-heat and intermittent shutdown faults.
OEM Goodman limits are factory-calibrated to the exact trip and reset temperatures for this furnace — critical for a safety device. Generic switches may carry incorrect temperature ratings, which can nuisance-trip or fail to protect the unit. Always match OEM specs on safety controls.
Easy — mounts with two screws and two spade terminals. Shut off power before servicing. Verify the color/temperature code matches before installing.