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The 10123517 is a genuine OEM manual-reset limit switch for the Goodman GME950805CXAB gas furnace. This normally-closed safety control monitors heat-exchanger or burner-area temperature and opens the ignition circuit if the furnace overheats — a common symptom of a blocked flue, dirty filter, failed blower, or restricted airflow. Because it is manual reset, it stays open after a trip and must be reset by hand, forcing a technician to find and correct the root cause before the furnace can fire again.
A limit switch is a life-safety component, so the trip temperature must match the furnace design exactly. Generic switches with the wrong calibration either nuisance-trip or, worse, fail to cut out when needed. This genuine OEM switch is factory-calibrated to the GME950805 specification for correct, reliable protection.
Requires removing the burner/cabinet panel, disconnecting two spade terminals, and unscrewing the mounting bracket. Shut off power and gas first. Best handled by a technician or an experienced DIYer familiar with furnace safety circuits.