E04
AEG
Water Pump Failure or Overload
E04 appears and the machine stops brewing; sometimes accompanied by unusual pump noise and no water at the spout.
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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
Failed ULKA vibration pump, Pump coil open or shorted, Blocked pump inlet due to scale or debris, Stuck pump check valve
How to Fix / Troubleshooting
Safety: Disconnect from mains and allow the machine to cool.
- Check water supply: Confirm the tank is full and properly seated. Replace any in-tank water filter that may be clogged.
- Listen to the pump: When starting a cycle (before the error appears), listen for the characteristic buzzing of the ULKA pump. No sound suggests electrical failure; a loud, strained buzz suggests blockage.
- Descale: Run a descaling cycle if possible. A partially blocked pump can sometimes be freed by thorough descaling.
- Access the pump: Remove the side or rear panel to locate the pump. Check for leaks, loose connectors, or kinked hoses at the pump inlet and outlet.
- Test the pump coil: With the machine unplugged, disconnect the pump and measure coil resistance. Compare to the ULKA specification (often 1–2 kΩ). Replace the pump if open or shorted.
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Repair Difficulty
Hard
4/5
Required Part
ULKA Water Pump
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