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The Lennox 10M79 (OEM part 10M7901), identifiable by its distinctive tan label, is a genuine Lennox limit control switch that monitors furnace temperatures and interrupts burner operation when a potentially unsafe overheat condition is detected. If your Lennox furnace is short-cycling, blowing cold air, or displaying a limit lockout fault code, this component is a likely culprit and should be inspected or replaced. Engineered to OEM factory specifications, this direct replacement ensures accurate temperature response and long-lasting reliability in compatible Lennox heating systems.