Display shows E10 and the milk system does not function correctly (no foam or no milk flow).

Safety first: Unplug the machine before disassembling the milk system. Hot steam may be present.

Step-by-step:

• 1. Clean milk accessories: Disassemble the Siemens milk frother, suction tube, and any milk container adapters. Soak them in warm water with a food-safe detergent, then rinse thoroughly.
• 2. Run milk cleaning program: Use the built-in milk system cleaning program with Siemens milk system cleaner if available. This dissolves dried milk inside internal lines.
• 3. Check milk source: Ensure the milk tube is fully submerged in fresh, cold milk and that there are no air leaks at the tube connections.
• 4. Inspect steam outlet: Remove any milk residue from the steam outlet nozzle using the supplied cleaning needle or a fine pin.
• 5. Professional service: If E10 persists and no milk is drawn despite a clean system, the internal milk pump or valve may be defective and should be replaced by a Siemens technician.