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The Lennox 16N67 is an OEM 120°F limit control switch that monitors heat exchanger temperatures and shuts down the burner if the system overheats, protecting your Lennox furnace and your home from potential hazards. Common signs of a failed limit switch include the furnace running continuously without heat, short-cycling, or the burner not lighting at all. This genuine Lennox OEM replacement part ensures a precise fit and restores safe, efficient furnace performance.