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The Lennox 60M59 (60M5901) is a genuine OEM high-limit switch designed to protect your Lennox furnace by shutting off the burner when temperatures reach 160°F, preventing dangerous overheating conditions. If your furnace is short-cycling, blowing cold air, or displaying a high-limit fault code, a failed limit switch is often the cause. This direct OEM replacement ensures proper fit and reliable performance in compatible Lennox heating systems.