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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM secondary safety control for the Goodman ADSS800403AXAB gas furnace and compatible models. This auxiliary limit provides an additional layer of over-temperature protection — typically monitoring the blower compartment or a secondary zone of the heat exchanger — and opens the control circuit to stop the burners when temperatures exceed safe limits. The light blue color code identifies its specific trip rating.
The OEM auxiliary limit is set to the precise temperature Goodman specifies for this furnace's secondary protection point. As a safety component, a generic switch with a mismatched trip point risks either nuisance lockouts or inadequate protection. The color-coded factory part ensures the correct calibration every time.
Easy — Mounts with two screws and connects via two spade terminals. Disconnect power first, match the light-blue color code to the original, and reconnect. Confirm normal furnace cycling after replacement.