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The Lennox 16X53 Limit Control is a genuine OEM high-limit safety switch rated to open at 150°F, interrupting burner operation when the heat exchanger or plenum temperature reaches unsafe levels to protect your Lennox furnace from thermal damage. Signs of a defective limit control include a furnace that short cycles, a blower motor that runs continuously, or a system that fails to produce heat altogether. This direct OEM replacement ensures proper temperature calibration and a precise fit for compatible Lennox heating equipment.