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The Lennox 60M96 (60M9601) is a genuine OEM limit switch that monitors the temperature of your Lennox furnace heat exchanger, cutting power to the burner if unsafe temperatures are detected. Common symptoms of a faulty limit switch include a furnace that runs continuously without heat, short-cycles, or fails to ignite. This OEM replacement part ensures precise temperature sensing and a direct fit for compatible Lennox heating systems.