Lennox LB-91256A 78K59 HD1-2 80K0201 Furnace Control Board is a Lennox replacement control board identified by the part numbers LB-91256A, 78K59, HD1-2, and 80K0201. This board serves as the electronic control module for Lennox furnaces, coordinating furnace operation according to the system’s inputs and internal logic. Use this board as a replacement component in Lennox heating systems that require the LB-91256A/78K59/HD1-2/80K0201 assembly.
