The display shows 'Empty grounds container' or a similar message, even when the container is empty and reinserted.

Safety first: Unplug the appliance before accessing any sensors.

Fix steps:

• Clean container: Wash and dry the grounds container thoroughly. Remove any coffee residues from the sides and bottom.
• Check alignment: Ensure the container slides fully into place and properly engages the sensor tab.
• Clean sensor: Wipe the sensor area inside the machine with a dry cloth. For optical sensors, ensure the sensor window is clear.
• Inspect actuator: If a plastic tab on the container is broken, replace the container so it can properly trigger the sensor.