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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue coded) is a genuine OEM secondary safety control for the WFD18045S3AXCC gas furnace and compatible Goodman/Amana models. The auxiliary limit provides backup overheat protection at a specific location — typically the blower deck or a secondary heat zone — and shuts the furnace down if temperatures exceed its set point. It works alongside the primary limit to guard against overheating, restricted airflow, and heat spillage.
This genuine OEM Goodman switch is calibrated to the trip temperature identified by its light-blue code. Auxiliary limits are location- and temperature-specific — a generic replacement with a different set-point can nuisance-trip or fail to protect. Matching the OEM part number and color removes the guesswork.
Easy (2/5). Around 15–20 minutes. De-energize the furnace, remove the mounting screws, move the leads to the matching terminals, and verify the light-blue 0130F00038 part number before powering up.
Low-cost genuine OEM part, in stock, with a fit guarantee for the WFD18045S3AXCC.