Lennox 21J99 Direct Spark Ignition Control Board

The Lennox 21J99 Direct Spark Ignition Control Board is used in most of the Lennox gas-fired heating systems, predominantly furnaces. This board does not use pilot lights as is common with other systems, but instead, it uses direct spark ignition technology for safety and efficiency. The 21J99 control board controls the ignition process, which is managed by the 21J99 control board. This does away with a standing pilot light flame, which would in turn result in operational efficiency.