How to Fix / Troubleshooting

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

Check water filter: If your Miele ice maker is connected through an external filter, replace the filter if it is older than recommended or shows reduced flow.
Inspect inlet valve screen: Remove the supply line and clean the mesh screen on the Miele inlet valve.
Verify pressure: Use a pressure gauge on the supply line; most ice makers require at least 20–40 psi. Correct any plumbing issues if pressure is low.
Check for partial freeze: Look for a section of the water line that is colder and rigid. Defrost the unit if necessary and adjust freezer temperature slightly warmer to prevent re-freezing.
Run a test cycle: After corrections, run several ice cycles and monitor cube size. If still small, replace the inlet valve.

Note: Persistent low fill can also be caused by a mis-calibrated control board, but this is less common than valve or pressure issues.

Ice maker shows F15, cubes are very small or hollow, unit reports ice production fault

Possible Causes