De Dietrich 200005240 Diematic 3/II GT/DTG display board

This is a De Dietrich Diematic 3/II GT/DTG display board, catalogue article 336.568.021, manufacturer code 200005240. It belongs to the category of electronic control boards (PCB). In modern wall-hung boilers, such control boards perform the same role as a standalone burner control: they manage the ignition sequence, enforce safety times (pre-purge, ignition, fuel admission, flame proving), and drive the fan, gas valve, and ignition transformer. The board also reads signals from the flame sensor (typically ionisation for gas boilers) and from pressure switches to confirm airflow and gas pressure. The "display" in the name indicates that this board includes a user interface for status indication and fault code readout. Selection of a replacement control board must be made by the exact part number, including any suffix or series designation. Boards of this type are matched to the specific boiler model and are not interchangeable across series, even within the same brand. Using a board with mismatched safety times, supply voltage, or electrical ratings creates a safety hazard. When replacing, verify that the connector patterns and wiring harness match the existing installation; modern boards often plug directly into a base or use terminal blocks. The flame detection method must also be consistent with the burner’s design (ionisation electrode versus UV detector). No further technical data for this specific article is provided beyond its identification codes; consult the boiler’s technical manual for detailed specifications.