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The Lennox 28G13 is a genuine OEM Carling Technologies TA26F-TLB-B-XLE3 mid-sized rocker interlock switch used in compatible Lennox HVAC systems to provide reliable manual switching and interlock protection during equipment operation. A worn or damaged 28G13 may result in failure to enable or disable system functions, intermittent operation, or safety interlock faults that prevent the unit from running. This direct OEM replacement ensures a proper fit and safe, consistent performance in supported Lennox equipment.