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The Goodman 10123533 Manual Reset Limit Switch is a genuine OEM high-temperature safety control for the GKS90904CXAH gas furnace. It monitors for abnormal heat or flame rollout conditions and opens the gas circuit if a dangerous temperature is reached. Because it is a manual reset device, it must be physically reset by pressing its button after a trip — a deliberate design that forces inspection of the underlying cause (such as a blocked flue, dirty filter, or failing blower) before the furnace can run again.
This genuine Goodman OEM limit switch is calibrated to the exact trip temperature specified for your furnace's heat exchanger and burner assembly. Generic switches with different set points can either nuisance-trip or, dangerously, fail to open when they should. For a life-safety component, always match the OEM specification.
Easy (2/5). Approximately 15 minutes. Shut off power and gas, note wire routing, remove the mounting screws, disconnect the terminals, install the new switch in the same orientation, and reconnect. If the switch trips again after reset, do not bypass it — diagnose the root cause or call a licensed HVAC technician.