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The Goodman 10123517 Manual Reset Limit Switch is the genuine OEM high-temperature safety control for the GCH950703BXAD gas furnace. This normally-closed thermal switch opens and locks out the furnace if it detects an over-temperature or flame-rollout condition, protecting the heat exchanger and your home. Because it is a manual-reset device, it must be physically reset with the button once the underlying cause is corrected.
The trip temperature and mounting footprint on this switch are matched to the GCH950 heat exchanger. Substituting a generic limit with a different set-point can cause premature nuisance trips or, worse, fail to protect against a real overheat. As a life-safety component, use the exact OEM part.
Easy (2/5). Disconnect power, remove two screws and the wire leads, and mount the replacement in the same orientation. If the switch keeps tripping, diagnose the root cause (blocked flue, dirty filter, cracked heat exchanger) before returning the furnace to service.