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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is a genuine OEM thermal safety switch for the Goodman AMS81205DXAA furnace. This normally-closed limit opens the control circuit if it senses excessive temperature — for example from restricted airflow, a dirty filter, or a failing blower — protecting the heat exchanger and cabinet from overheating. The light-blue body color designates its specific trip temperature rating.
Because this is a safety component, exact trip temperature matters. The OEM Goodman switch is calibrated to the furnace's design temperature — matched by the light-blue color code. We strongly recommend OEM over generic for any limit or safety switch.
Easy (2/5). Two screws and two spade terminals. Always shut off power and gas before servicing. If the switch keeps tripping, diagnose the underlying airflow issue before replacing.