E17 appears and the machine cannot detect coffee beans; it may prompt to fill the hopper even when full.

Safety first: Turn OFF and unplug before working near the grinder.

• Stir beans: Remove the hopper lid and stir the beans to break any bridges that prevent beans from falling into the grinder.
• Use different beans: Avoid very oily dark-roast beans that can stick together. Try a medium roast with a drier surface.
• Clean bean chute: Empty the hopper and vacuum or brush out the chute leading to the grinder. Ensure no residue is blocking the path.
• Check sensor (if present): Some models use an optical or mechanical sensor in the hopper. Clean the sensor window and ensure any moving parts are free.
• If E17 persists: The grinder load detection or bean sensor circuit may be faulty and require professional diagnosis.