E21
Neff
Circulation pump blocked or overloaded
Dishwasher shows E21; circulation pump may attempt to start repeatedly and then stop.
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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 circulation pump, Impeller jammed by debris, Partially seized pump bearings, Overcurrent detected by control
How to Fix / Troubleshooting
Safety: Disconnect power and water before accessing the base.
E21 is closely related to a mechanical blockage or overload of the circulation pump.
- Remove filters: Take out the bottom filters and inspect the sump for foreign objects that could reach the pump.
- Access pump: Remove the base panel and detach the circulation pump from the sump.
- Clear blockage: Carefully inspect the impeller and housing for glass shards, toothpicks, or other debris. Remove all obstructions.
- Check impeller play: Ensure the impeller is firmly attached and not wobbling excessively.
- Reassemble and test: Refit the pump, ensuring all seals and clamps are correctly positioned. Run a test cycle to confirm normal operation.
- Replace pump if needed: If the pump still trips E21 or feels rough when turned by hand, replace the Neff circulation pump.
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Repair Difficulty
Hard
4/5
Required Part
Circulation Pump
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