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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-temperature safety control for ACES801005CXAA gas furnaces. This switch monitors heat-exchanger temperature and cuts power to the gas valve if the furnace overheats — a critical protection against a failed blower or restricted airflow. Because it is a manual reset device, it must be pressed to restore operation after a trip, alerting the homeowner that a fault occurred.
Safety controls are not the place to economize. The OEM 10123529 is calibrated to the exact trip temperature Goodman specifies for this heat exchanger. A generic switch with the wrong setpoint can nuisance-trip or, worse, fail to protect against overheating. Always use OEM for limit and safety devices.
Install Difficulty: Easy (2/5). Two-screw mount with quick-connect terminals. Shut off gas and power, and diagnose the root cause of any limit trip before resetting.