Melitta Latticia OT: clean the milk system when Clean and Steam stay lit

Melitta Latticia OT: the final quick-water rinse was not completed after the milk-system cleaning sequence, so both symbols remain active. Follow the manufacturer sequence before replacing a part or requesting service. Use the exact model and light or message pattern before changing a setting. The checks stay within removable brewing, milk, water and drip-tray items described by the manufacturer. What this exact symptom means: the final quick-water rinse was not completed after the milk-system cleaning sequence, so both symbols remain active. What to distinguish first: Confirm that the displayed or observed condition exactly matches “clean the milk system when Clean and Steam stay lit” before changing anything. 1. Confirm the model and signal — Confirm that the displayed or observed condition exactly matches “clean the milk system when Clean and Steam stay lit” before changing anything. 2. Prepare the appliance safely — Complete the normal shutdown, unplug the machine, let hot parts cool and empty the drip tray before removing user-accessible parts. 3. Carry out the official user check — Put the milk tube in clean tap water, hold Milk Foam for more than two seconds and let the quick rinse finish completely. 4. Interpret one controlled retest — Reassemble every part in its documented position and run one short rinse or one beverage. A repeated signal after the stated check requires service rather than repeated resets. The official Melitta page documents this model-family symptom and the user-level procedure above. Keep water out of the bean hopper, grinder and electrical openings. Never force a brew unit, valve, grinder control or hot steam part. Stop and contact the manufacturer if the same signal returns after one correct cycle, a grinder contains a foreign object, a hot-water leak appears or the machine trips power.