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The Lennox 96W85 (OEM part 103320-02) is a 200°F auto-reset limit control switch designed to protect your Lennox furnace from dangerous overheating conditions by shutting off the burner when temperatures exceed the rated threshold. If your furnace is short-cycling, failing to heat, or displaying a high-limit fault code, a failed limit switch is a common cause. This genuine OEM replacement ensures direct compatibility with applicable Lennox furnace models for a reliable, code-compliant repair.