21J99 | Lennox 105802-02, Direct Spark Ignition Control Board, 30-105K Btuh Unit Heaters | Lennox

**Lennox DSI Control Board (21J99)** The Lennox DSI Control Board (21J99) is a crucial electronic component designed to manage ignition sequences in heating systems. This advanced board plays a vital role in ensuring safe, reliable, and efficient operation of furnaces and other heating appliances. **Key Features:** - Controls the ignition process, including spark generation, gas valve timing, and flame sensing - Monitors system safety parameters to prevent potential hazards - Provides diagnostics and troubleshooting capabilities to simplify maintenance - Compatible with various Lennox heating equipment models **Benefits:** - Enhanced energy efficiency by optimizing ignition timing - Improved safety through precise control of gas flow and flame detection - Reduced downtime due to rapid diagnostics and easy serviceability - Peace of mind knowing your heating system is operating at peak performance **Applications:** - Gas-fired furnaces and heating appliances from Lennox - Ideal for applications requiring precise ignition control and safety monitoring Our HVAC supply store offers the best prices and fast shipping on Lennox DSI Control Boards. Ensure the optimal performance of your heating system with our genuine Lennox parts and exceptional customer service.