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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue body) is a genuine OEM safety control for the Goodman/Amana AMH80905CXCA 80% AFUE gas furnace and related models. This normally-closed thermal switch monitors temperature at its mounting location and opens the low-voltage circuit if it senses excessive heat — shutting the furnace down to prevent damage to the heat exchanger and surrounding components. A tripped or failed auxiliary limit is a common cause of no-heat and intermittent shutdowns.
Limit switches are trip-temperature specific. The light-blue 0130F00038 is calibrated to the exact set point Goodman specifies for this furnace. Installing a generic switch with the wrong trip point either nuisance-trips (false no-heat) or fails to protect the equipment. Always match the OEM part and color to keep the safety chain within factory spec.
Easy — About 10 minutes. Disconnect power, remove the two mounting screws, transfer the spade connectors to the new switch, and remount. No adjustment needed. Verify heating operation and that the blower cycles normally afterward.
Do not bypass a limit switch — replace it. Genuine OEM safety part, ready to ship.