Record manufacturer, exact device and controller model, complete error code and when the fault occurs. Existing photographs and version details help.
Email support@gema-net.de. Firmware and replacement controls must match the exact version. Do not install unknown firmware or copy settings from a similar model without confirmed compatibility.
Never bypass safety functions. For dangerous symptoms such as smoke, gas smell or overheating, use the appropriate emergency procedure and a qualified professional. The service chat is not an emergency service.