Replacement Control Board

This Lennox 81W11 replacement control board is an OEM-quality ignition circuit board designed for single-stage furnace systems. Compatible with Lennox, Armstrong, and Ducane furnace models, this board serves as a direct replacement for worn or damaged original equipment, restoring reliable ignition control and system operation. The board operates at 24VAC with a voltage range of 18-30VAC, supporting both 50 and 60Hz frequencies for flexibility across different electrical installations. Its compact design measures 5 inches in height by 5.8 inches in width, weighing approximately 0.5 lbs, making it easy to install and integrate into existing furnace assemblies without requiring extensive modifications. Built to OEM specifications, this control board (also referenced as part number 103085-01 or 81W1101) delivers consistent performance in single-stage ignition applications. The board is engineered to withstand the demands of commercial and residential HVAC systems, providing stable electrical control and reliable furnace operation. For facilities currently operating Lennox 81W11 systems or seeking compatible replacement parts, this control board offers a cost-effective maintenance solution. It is also compatible with alternative part number 56W19. Note that Lennox has superseded this model with the 94W83 control board (103085-03) for new installations, though this 81W11 remains an excellent replacement option for existing systems requiring original specifications. Ideal for HVAC contractors, facility maintenance teams, and furnace repair professionals, this replacement board reduces downtime and restores furnace functionality quickly and reliably.