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The Goodman 10123517 Manual Reset Limit Switch is a genuine OEM high-temperature safety control for the GCH90703BXAA gas furnace and compatible Goodman/Amana models. This normally-closed switch opens the control circuit and shuts off the burners if it senses an overheat condition — typically from a blocked flue, dirty filter, failed blower, or flame rollout. Because it is manual reset, it will not automatically re-close, forcing a technician to inspect the cause before the furnace can run again.
The OEM 10123517 is calibrated to the exact trip temperature and bracket footprint specified for this furnace's heat exchanger and burner box. Generic limit switches with the wrong trip point either nuisance-trip or, worse, fail to open during a real overheat. For a safety device, always use the factory-rated OEM control.
Easy (2/5). Shut off power and gas, remove two mounting screws and the wire terminals, install the new switch in the same orientation, and reconnect. Verify the underlying overheat cause before pressing reset.