De Dietrich 200005048 Diematic M3 sensor board

The De Dietrich 200005048 Diematic M3 sensor board (catalogue article 336.568.011) is an electronic control board (PCB) intended for use in the Diematic M3 control system. Parts of this type serve as an interface between the system sensors and the main logic board, processing signals from temperature sensors such as NTC thermistors, pressure switches, and possibly flow sensors. The module converts these readings into data that the controller uses to manage burner output, pump operation, and safety checks. In modern wall-hung boilers, sensor boards are model-specific and are not interchangeable across different series or brands. The correct replacement must match the exact series designation and typically the boiler model. When sourcing a sensor board of this type, the primary selection criterion is the original equipment part number and the control system variant (here Diematic M3). Because the board communicates directly with the main controller and may also supply auxiliary voltages to sensors, substituting a board with a different firmware version or connector pattern can cause communication errors or incorrect system behaviour. Always confirm the board’s shape, connector layout, and the presence of any jumpers or coding pins that match the existing installation. A mismatched board may prevent the boiler from starting or may produce erratic modulation. In service, a faulty sensor board typically leads to incorrect temperature readings, failure to modulate, or error codes on the display. Before replacing, verify that the sensors themselves are functional and that wiring and connectors are in good condition. The board is normally located within the boiler control panel and is field-replaceable, but care is required when handling electrostatic-sensitive components. No adjustments of safety times or burner parameters are made on this board; such settings reside in the main control logic.