Melitta coffee machines are known for reliable bean-to-cup performance, but issues can still occur, particularly as the machine builds up residue or scale over time. Common problems include the machine not dispensing coffee, weak or no water flow, grinder faults, or milk systems not producing proper foam. These issues are often caused by blockages within the brew unit, limescale restricting internal water flow, or worn components affecting performance. Melitta machines typically provide clear alerts or indicators when maintenance is required, making it important to follow regular cleaning and descaling routines. In many cases, thorough cleaning of the brew unit and internal systems will resolve the issue, but ongoing faults may require deeper diagnosis or replacement of internal parts.