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The Lennox 26W15 (OEM part 100079-06) is a 160°F high-limit control switch designed to protect your Lennox furnace from dangerous overheating conditions by shutting off the burner when temperatures exceed the preset threshold. If your furnace is short-cycling, failing to heat, or shutting off unexpectedly, a faulty limit switch is a common culprit. This direct OEM replacement ensures proper fit and function in compatible Lennox heating systems.