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The Goodman 0130F00038 Auxiliary Limit Switch (identified by its light blue body) is a genuine OEM temperature safety control for the Goodman GCH91155DXAE gas furnace. This normally-closed thermal switch monitors for abnormal heat conditions and opens the circuit to shut down the furnace if temperatures exceed its trip point — protecting the heat exchanger and surrounding components from overheating and preventing potential fire hazards.
Limit switches are color- and temperature-coded for a reason — the light blue OEM switch is calibrated to the exact open/close temperatures your furnace requires. Installing a generic switch with the wrong trip point causes either nuisance shutdowns or, worse, failure to trip when it should. Always match the OEM part.
Easy (2/5) — Disconnect power, remove two mounting screws, transfer the wire connectors, and reinstall. Verify the correct color/temperature rating before ordering. Roughly 20 minutes for a confident DIYer.