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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety control for the VMS80403AXAA gas furnace and compatible Goodman/Amana models. Mounted on the burner box, this manual-reset rollout switch opens the ignition circuit if it senses flame rollout or dangerous overheating, shutting down the burners to prevent damage and unsafe combustion. Because it is manual-reset, a tripped switch signals a real problem (blocked flue, cracked heat exchanger, or clogged burners) that should be diagnosed before resetting.
This is a life-safety component. Genuine Goodman OEM switches are calibrated to the exact trip temperature the furnace was engineered for. Generic switches with the wrong set-point can either nuisance-trip or, worse, fail to open when they should. Always use OEM for safety controls.
Easy (2/5). Two mounting screws and two push-on spade terminals. Turn off gas and power, transfer the wires one at a time, and mount the new switch. Always determine why the old switch tripped before returning the furnace to service.