F11
Miele
Backflow or Drain Sensor Fault
Miele interface shows F11 water backflow or drain sensor error when disposal is used with a Miele dishwasher.
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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
Improper air gap installation, Blocked dishwasher-to-disposal inlet, Incorrect height of drain hose, Faulty backflow sensor in Miele system
How to Fix / Troubleshooting
Safety first: Turn off power to both the disposal and dishwasher before working on shared plumbing.
- Check air gap: If an air gap is installed, remove the cap and clean any debris. Ensure the air gap is not blocked.
- Inspect dishwasher inlet: Detach the dishwasher drain hose from the disposal inlet and clear any obstruction. Confirm the knockout plug has been removed.
- Verify hose routing: Ensure the dishwasher drain hose has a proper high loop or air gap above the sink level to prevent backflow.
- Sensor reset: After clearing blockages, run a rinse cycle on the dishwasher and operate the disposal with water to confirm proper drainage. If F11 persists, the Miele backflow sensor may require service.
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Repair Difficulty
Medium
3/5
Required Part
Dishwasher Drain Inlet
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