The Lennox 27A07 DSI Ignition Control Board is a replacement electronic control designed for compatible Lennox gas-fired HVAC equipment. It manages the direct spark ignition sequence by controlling the ignition system and coordinating burner operation for reliable flame establishment. Used in compatible furnaces and heating systems, the board helps ensure proper startup, burner contro... https://www.partshnc.com/lennox-27a07-dsi-ignition-control-board