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The 10123529 is a genuine OEM manual-reset limit / flame-rollout switch for Goodman VMS80804BNAA gas furnaces. Mounted on the burner bracket, it is a normally-closed safety control that opens and cuts power to the gas valve if it senses abnormal heat from flame rollout — a serious condition usually caused by a blocked heat exchanger or restricted venting. Because it is manual-reset, it stays open until the button is physically pressed, forcing the homeowner or technician to investigate before the furnace can restart.
The OEM 10123529 is calibrated to the exact trip temperature Goodman's engineering specifies for this furnace. A generic switch with the wrong setpoint is a safety liability — trip too high and it fails to protect, too low and you get nuisance shutdowns. Always use OEM for safety controls.
Easy (1/5). Two mounting screws and two spade terminals. About 10 minutes with power and gas off.
Never bypass a rollout switch. If it keeps tripping, have the heat exchanger and venting inspected.