Machine shows E17: the used coffee grounds container is not detected or is reported as full even when empty.

Safety: Unplug the machine before reaching inside the grounds compartment.

Steps:

• 1. Remove and clean container: Take out the used grounds container and wash it thoroughly. Dry completely before reinserting.
• 2. Inspect sensor area: Look inside the compartment for a small switch or optical sensor. Clean coffee dust and residue with a dry brush or compressed air.
• 3. Check container tabs: Ensure any plastic tabs or magnets on the container that actuate the sensor are intact.
• 4. Test sensor (advanced): Use a multimeter to test the microswitch or verify the operation of an optical sensor. Replace if found to be non-functional.

Resolution: Replace the grounds container or sensor assembly if physical damage or sensor failure is detected.