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The Goodman 0130F00038 Auxiliary Limit Switch (color-coded light blue) is a genuine OEM secondary safety control for the Goodman GDH80403AXBB gas furnace. This auxiliary limit provides an additional layer of overheat protection beyond the primary limit, opening the control circuit if a specific zone — such as the blower compartment — exceeds its safe temperature threshold.
Like the primary limit, the auxiliary switch is calibrated to a defined trip temperature indicated by its light blue color code. This genuine Goodman OEM part guarantees the correct rating and bracket fit. Do not confuse it with the pink primary limit (0130F00036) — the two are calibrated differently and are not interchangeable.
Easy — Screw-mounted with quick-connect terminals. Cut power, match the light-blue color code, and replace. Confirm proper furnace cycling after installation.