Replacement Control Board

This Lennox 101573-01 replacement control board is a 24V SureLight furnace ignition control circuit board engineered to manage ignition sequences, heating operations, and related critical functions in gas furnace systems. Designed for reliability in commercial and residential HVAC applications, this board maintains consistent performance across varying operational loads with its standardized 24V output compatible with Lennox HVAC system architectures. The board features robust electrical specifications requiring proper grounding and correct 120V supply polarity for optimal operation. Electrostatic discharge precautions are integrated into the design to protect sensitive electronic components during installation and maintenance. This replacement control board is compatible with multiple Lennox furnace models and serves as a direct substitute for original equipment part numbers including 33W10, 43W18, 605341-01, and 101905-01. Cross-compatibility extends to allied brands including Armstrong, Concord, and Ducane systems, making this a versatile solution for multi-brand HVAC service operations. Ideal for HVAC contractors, facilities managers, and heating system technicians, this control board delivers reliable ignition control and operational management in demanding industrial and commercial heating environments. Installation requires standard electrical knowledge and adherence to manufacturer specifications for voltage supply and grounding protocols. Stock this essential component for faster system repairs and reduced downtime in furnace maintenance and replacement applications.