Machine shows E04 and will not start brewing; sometimes accompanied by unusual grinding or clicking noises in models with built-in grinders.

Safety: Unplug the machine before working near the grinder. Keep fingers away from burrs.

• Empty bean hopper: Remove all beans from the hopper. Vacuum out loose grounds from the top of the grinder.
• Check for foreign objects: With a flashlight, inspect the grinder inlet for stones, screws, or other objects. Remove any obstruction with tweezers.
• Manually free the burrs: If accessible, rotate the upper burr carrier by hand (or with the grind adjustment knob) to loosen compacted coffee. Do not force it excessively.
• Clean grinder: Remove the upper burr (if user-removable on your Zwilling model). Brush away compacted coffee from both burrs and the chute. Reassemble.
• Test without beans: Plug in, leave the hopper empty, and start a grind cycle. If the grinder runs smoothly without E04, add a small amount of beans and test again.
• If motor still stalls: The grinder motor may be worn or the control board's driver circuit may be faulty. Replacement of the grinder motor assembly or main board is recommended and may require a professional.