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The Lennox 47W65 (102135-02) is a genuine OEM 230°F-rated control-limit switch designed to shut down your Lennox furnace burner when heat exchanger temperatures reach 230 degrees Fahrenheit, preventing heat exchanger damage and potential safety hazards. Symptoms of a failed limit control include a furnace that short-cycles, blows only cold air, or keeps the blower running after the heat shuts off. This direct-fit OEM replacement matches the original 230°F trip rating and is engineered specifically for compatible Lennox furnace applications.