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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is the genuine OEM secondary high-limit/rollout safety control for the ACEC800804BXAA gas furnace. The light-blue color code denotes its distinct temperature trip rating, separate from the primary limit. This auxiliary switch adds a second layer of overheat protection — typically guarding the blower compartment or burner area — and opens the control circuit to shut off the burners if an unsafe temperature is reached.
Because this is a life-safety overheat control, only the genuine OEM 0130F00038 with the correct light-blue trip rating should be used. Do not substitute the pink primary limit (0130F00036) — the two ratings are not interchangeable. Matching the color code is critical.
Easy — disconnect power, unplug the spade terminals, remove the mounting screws, and install the replacement in the same orientation. About 15 minutes.