Machine powers on but will not start brewing; pressing the start button does nothing.

Safety first: Do not force any doors or trays; unplug the machine if you need to inspect internal parts.

• Check all removable components: Ensure the water tank, drip tray, coffee grounds container, and brew group are correctly installed and fully seated.
• Verify door closure: Close the service door firmly until it clicks.
• Observe display icons: Many Grundig models show icons when a component is missing. Insert the indicated part.
• Test control panel: Try other buttons or menu options. If none respond, the user interface may be faulty and require service.