How to Fix / Troubleshooting

Safety: Turn off the 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 the freezer temperature slightly warmer to prevent re-freezing.
Run a test cycle: After making corrections, run several ice cycles and monitor cube size. If cubes are still small, replace the inlet valve.

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

Ice maker displays F15, cubes are very small or hollow, and the unit reports an ice production fault.

Possible Causes