E10 error; machine reports water system issue and refuses to start brewing.

Safety: Disconnect from mains before internal inspection.

• Check tank seating: Remove and firmly reinsert the water tank. Ensure it clicks into place and the float inside moves freely.
• Clean sensor area: Wipe the area where the tank meets the machine with a damp cloth to remove coffee or scale residues that may interfere with the sensor.
• Test float magnet: In models using a magnetic float, verify that the float rises when the tank is filled. If it is stuck, clean the tank thoroughly or replace it.
• Inspect reed switch: Access the internal side of the tank area and locate the reed switch or optical sensor. Check for broken wires or loose connectors and repair as needed.