The Hörmann (Hormann) D437635 Electronic Board SD8500 is a genuine OEM control PCB designed as a direct replacement for select Hörmann door operator systems that use the SD 8500 control platform. As the central control module, it governs motor operation, interprets limit or encoder signals, and interfaces with connected safety devices and accessories. Using this replacement board restores proper operator functionality when the original control board has failed, making it a practical solution for maintenance or repair in residential or commercial door applications where the SD8500 board is specified.
Installation involves fitting the board inside the operator/control enclosure and transferring the existing wiring harnesses and connectors to the corresponding terminals. Power must be disconnected before service, and handling should follow ESD-safe practices. After installation, the operator may require setup and programming according to the product’s service manual, such as re-establishing travel limits and verifying the operation of photocells, safety edges, and any external controls. For compatibility, match the part number D437635 and SD 8500 designation with your operator’s documentation or ID label, and have installation and commissioning performed by a qualified technician to ensure safe, compliant operation. SEO terms: Hörmann SD8500 control board, Hormann electronic board, garage door opener PCB, industrial door operator replacement part, genuine Hörmann spare, control unit SD 8500.