E20
Grundig
Drain System Blockage or Pump Overload
Dishwasher shows E20 and may stop with water in the tub; drain pump may run but water does not leave properly.
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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
Severe blockage in drain hose or sink trap, Blocked air gap (if fitted), Partially seized drain pump, Foreign object in pump housing
How to Fix / Troubleshooting
Safety first: Disconnect power. Expect water spillage when disconnecting hoses.
- Clean filters and sump: Remove and clean all filters and inspect the sump for debris.
- Check sink connection: Disconnect the drain hose from the sink trap or garbage disposer. Clean the spigot thoroughly; many blockages occur here.
- Inspect air gap (if present): If your installation includes an air gap on the countertop, remove the cap and clean out any debris.
- Access drain pump: Remove the base cover and inspect the drain pump for obstructions. Remove the pump and clean the impeller area.
- Test pump operation: After cleaning, briefly run a drain program with the hose directed into a bucket to confirm strong flow.
- Replace pump if weak: If the pump is noisy, weak, or fails to spin freely, replace it.
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Repair Difficulty
Medium
3/5
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