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The Goodman 10123519 is a genuine OEM manual-reset high-limit safety switch for the GKS91155DXAA gas furnace. This normally-closed thermal switch opens the ignition/gas-valve circuit if it senses an overheat condition — typically from a blocked flue, dirty filter, or failed blower. Because it is a manual reset device, it must be pressed back in after a trip, alerting the homeowner that a fault occurred rather than silently cycling.
This genuine Goodman OEM switch is calibrated to the exact trip temperature specified for this furnace. A generic switch with the wrong setpoint can nuisance-trip or, worse, fail to protect the heat exchanger. As a life-safety component, the OEM part is strongly recommended.
Easy (2/5). Shut off power and gas, remove two mounting screws, transfer the two spade connectors, and reinstall. About 15 minutes. Important: if the switch keeps tripping, diagnose the underlying overheat cause before returning the furnace to service.
Match the part number to your furnace nameplate before ordering — trip temperatures vary by model.