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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is a genuine OEM thermal safety cutout for the AMVC81005CNBC 80% AFUE two-stage variable-speed gas furnace. This normally-closed switch monitors temperature in the blower or burner area and opens the control circuit if the furnace overheats — typically from a dirty filter, blocked return, or failed blower — shutting off the gas valve to prevent heat-exchanger damage or fire. The light-blue color code identifies its specific trip temperature rating.
OEM vs. Generic: The genuine Goodman switch is factory-calibrated to the exact trip and reset temperature this furnace requires. Installing a generic switch with a different rating can cause nuisance trips or, worse, fail to cut off during a real overheat. For a safety component, always match the OEM part and color.
Install difficulty: Easy to moderate — two mounting screws and two spade terminals, about 15–20 minutes. Cut power before servicing and confirm the color/rating matches the removed switch.