Miele
Mechanical Drive or Grinder Noise
Machine makes loud knocking or grinding noises during brewing
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Foreign object in grinder, worn grinder burrs, misaligned brew drive gears, dry or worn brew unit joints
How to Fix / Troubleshooting
Safety first: Unplug the machine before accessing internal mechanisms.
User-level steps:
- Remove beans from the hopper and check for stones or foreign objects.
- Clean the grinder inlet and chute with a vacuum and brush.
- Remove and clean the brew unit; apply food-safe silicone grease to the specified joints and seals.
Technical inspection:
- Listen carefully to identify whether the noise comes from the grinder or brew drive.
- Inspect the brew drive gears for wear or broken teeth.
- Check grinder mounting screws and motor mounts for looseness.
Resolution:
- Replace worn grinder burrs or the complete grinder assembly if noisy or damaged.
- Replace damaged brew drive gears and lubricate per Miele specifications.
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Repair Difficulty
Medium
3/5
Required Part
Coffee Grinder Assembly / Brew Drive Gear Train
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