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The Goodman 20162903 Primary Limit Switch is a genuine OEM high-limit control rated at 150°F, engineered for the AMH950905DXAB gas furnace. Mounted on the heat-exchanger or blower housing, this primary limit continuously monitors supply-air temperature and opens the circuit if the furnace overheats — typically from restricted airflow such as a dirty filter or failed blower. This protects the heat exchanger from damage and prevents unsafe operating temperatures.
OEM vs. Generic: This genuine OEM limit is factory-calibrated to open at precisely 150°F. Generic switches with approximate ratings can nuisance-trip during normal high-fire operation or fail to open in time, risking heat-exchanger damage. For accurate temperature protection, OEM is strongly recommended.
Install Difficulty: Easy (2/5). Two mounting screws and spade terminals. Disconnect power first, and always correct any underlying airflow restriction before returning the furnace to service.