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The Lennox 10G92 is a genuine OEM high-limit control set to trip at 180°F, designed to interrupt furnace operation when excessive heat is detected, protecting the heat exchanger and other critical components from thermal damage. A failing limit control may cause your Lennox furnace to short-cycle, blow cold air, or trigger a lockout condition on your thermostat or control board. This direct OEM replacement part (100611-11) delivers an exact fit and dependable performance in compatible Lennox furnace models.