Machine displays 'Add Beans' or similar message even though the hopper is full.

Safety first: Unplug the machine before cleaning the hopper area.

• Stir beans: Gently stir the beans to ensure they fall into the grinder inlet.
• Clean sensor window: If your Grundig model has an optical bean sensor, wipe the sensor window inside the hopper with a dry cloth.
• Use standard beans: Avoid extremely light or irregular beans that may not feed consistently.
• Service if persistent: If the message remains despite a full hopper and normal beans, the sensor or its wiring may need replacement.