Replacement Control Board

This replacement control board is engineered for Lennox furnaces and compatible HVAC systems requiring reliable ignition sequencing and flame monitoring. The LENNOX 104278-01, also designated as model 12J99, is a 24 VAC ignition control board that manages safe combustion through precise gas flow control and ignition timing. Measuring 6 inches by 6 inches by 6 inches and weighing approximately 0.79 to 0.85 lbs, this compact board integrates seamlessly into existing HVAC installations. Operating at 24 VAC, the board provides dependable performance for residential and light commercial heating applications. This part replaces multiple legacy control boards including 60M32, 78L27, R44990-001, R46994-101, 43L04, 60M3201, 78L2701, and 43L0401, making it an ideal solution for system upgrades and repairs. The board delivers consistent ignition control and flame detection capabilities essential for safe furnace operation. HVAC technicians and facility managers can rely on this component for maintaining proper combustion sequences and system safety protocols. Suitable for retrofit applications and new installations, the LENNOX 104278-01 offers plug-and-play compatibility with standard Lennox furnace configurations. This replacement board meets industry standards for ignition control systems and provides the reliability required in both scheduled maintenance and emergency repair scenarios.