The Hörmann (Hormann) D437633 Electronic Board SD5500 is an original OEM replacement control board designed specifically for SD 5500 control systems. Serving as the core logic module, it manages the operator’s inputs and outputs, coordinating motor control, travel limits, safety devices, and accessories to restore stable, reliable door or gate operation when the original board has failed. Using the D437633 ensures proper compatibility with the SD5500 platform and preserves intended performance for compatible Hörmann industrial or commercial door operators that were supplied with this control system.
This replacement PCB is not universal and should only be used in SD 5500 controllers; verify the part number D437633 on the existing board or in the Hörmann service documentation before ordering. Installation should be performed by a qualified technician with the power isolated and ESD precautions observed. After fitting, the system may require configuration and re-teaching per the SD 5500 manual, including limit and accessory setup, to ensure correct function and compliance with safety standards. For best results and assured compatibility, pair this board with Hörmann-approved sensors, photocells, safety edges, and operator components designed for the SD5500 control architecture.