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The main board is the central control unit of a boiler or burner, managing all electronic functions including ignition, temperature regulation, and safety checks. It processes signals from sensors and sends commands to actuators. A faulty main board can cause erratic behavior or complete system failure. When replacing this component, it is crucial to use a compatible board with the correct firmware. The main board is a critical spare part for restoring full functionality to your heating system, so choose a reliable replacement to ensure long-term performance.