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The Goodman 10123535 Manual Reset Limit Switch (Red) is a genuine OEM safety control for GKS90904CXAA gas furnaces. The red button identifies this as a higher trip-temperature limit or flame rollout switch within the furnace safety chain. It monitors for abnormal heat conditions — such as a blocked flue or flame rollout at the burner box — and cuts power to the gas valve to prevent hazardous operation. Its manual reset design ensures a technician inspects the unit before it can restart, adding a critical layer of homeowner safety.
OEM vs. Generic: The color coding and calibration of Goodman limit switches are model-specific. Installing a generic or wrong-colored switch can place the incorrect trip temperature in a safety circuit, defeating its purpose. The OEM 10123535 guarantees the correct rating and mounting for your furnace.
Install Difficulty: Easy — typically a 15–20 minute swap with basic hand tools. Disconnect electrical power and shut off gas before servicing. When in doubt, use a licensed HVAC technician.