Miele ice maker ice cubes are very small or hollow, but no error code is shown

Safety: Turn off water and disconnect power before servicing water components.

• Replace or bypass filter: Temporarily bypass the external filter to see if cube size improves. If it does, replace the filter.
• Clean valve screen: Remove and clean the inlet valve screen of sediment.
• Check pressure variation: Measure water pressure at different times. If it drops significantly, consult a plumber.
• Inspect fill tube: Check the fill tube for partial ice blockage. Defrost gently with warm air from a safe distance.

Note: Persistent small cubes after these steps may indicate a valve that should be replaced.