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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is a genuine OEM high-temperature safety control for the Goodman VMS80403AXAA gas furnace and compatible VMS80 series models. This auxiliary limit opens the burner circuit if it senses excessive temperature — for example from a blocked blower or restricted airflow — protecting the heat exchanger and cabinet from overheating. The light-blue body denotes its specific temperature trip rating.
Limit switches are calibrated to an exact trip and reset temperature. Installing a switch with the wrong rating (or the wrong color code) can cause nuisance shutdowns or, worse, fail to protect the furnace. This OEM Goodman part matches the factory trip point exactly — never substitute by appearance alone.
Easy. Usually two mounting screws and push-on terminals — 10-15 minutes. Cut power first, transfer wiring one lead at a time, and confirm the furnace cycles normally after replacement.