De Dietrich 300009704, płytka drukowana (płytka sterująca)

This is the De Dietrich 300009704 electronic control board (PCB), also listed under manufacturer codes 300009704 and 336.568.014. The catalogue article number is 336.568.014. Parts of this type are the main control boards in modern wall-hung boilers, performing the same function as a standalone burner control or flame safeguard. They manage the entire ignition and safety sequence: initiating pre-purge, energising the ignition transformer, opening the gas valve, and monitoring flame presence via the ionisation electrode. They also read signals from pressure switches and temperature sensors, and drive the fan and pump as required. The board is matched to the specific boiler model and series. When sourcing a replacement PCB of this type, matching is critical. The board must correspond to the exact boiler model and series, as the programming, safety times, and electrical connections are specific to each variant. Even within the same brand, a board from a different series may not be interchangeable. Key parameters that define the correct part include the supply voltage, the configuration of plugs and connectors, and the programmed logic for ignition and modulation. Without the correct board, the boiler may not start, or safety functions may be compromised. For a heating engineer replacing such a board, the only reliable identification is the original part number or the boiler model and serial number. The board is typically located inside the boiler casing. Before ordering, confirm the boiler's exact type designation and cross-reference the original board's code. Do not rely on visual similarity alone, as internal firmware can differ. This De Dietrich PCB is listed by its manufacturer codes, which should be checked against the existing board.