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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM secondary safety control for the AMH81155CXCB gas furnace. The light-blue color code identifies its unique trip temperature and mounting point, separate from the primary limit. This auxiliary limit provides an additional layer of overheat protection — commonly guarding the blower compartment or a secondary section of the heat exchanger — and opens the gas circuit if temperatures climb beyond a safe range.
OEM vs. Generic: The light-blue 0130F00038 is calibrated to a different trip point than the pink primary limit — the color codes are not interchangeable. Installing the wrong switch defeats the layered safety design and can cause nuisance trips or unsafe operation. Match the OEM color exactly.
Install difficulty: Easy to moderate. De-energize the furnace, remove the mounting screws and terminals, and install the same light-blue OEM part in the original location. Verify normal cycling and airflow after replacement.