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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is a genuine OEM safety control for the VMS80805CXAA gas furnace and compatible Goodman/Amana models. This secondary thermal switch backs up the primary limit, opening the control circuit if it detects abnormal heat in its zone of the furnace cabinet — protecting against overheating from blocked airflow or a blower failure. The light-blue color code identifies its specific factory-calibrated trip rating.
The OEM 0130F00038 carries the exact trip temperature indicated by its light-blue coding and the correct terminal layout. Substituting a differently-rated generic switch can defeat the intended safety envelope, causing either nuisance shutdowns or inadequate protection. Match the color-coded OEM part for correct furnace safety.
Rating: Easy (2/5). Two screws and two spade terminals. Disconnect power and gas before servicing. Confirm the replacement matches the light-blue rating of the original. Roughly a 15-minute job for a confident DIYer.