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The Lennox 60M58 (60M5801) is a genuine OEM high-limit switch rated at 195°F, designed to shut down the burner when the heat exchanger reaches unsafe temperatures, preventing damage and potential hazards. If your Lennox furnace is short-cycling, failing to ignite, or displaying a limit fault code, a faulty limit switch is often the cause. This direct OEM replacement ensures proper fit and reliable protection for compatible Lennox furnace models.