E90
Zanussi Communication Error Between User Interface and Main PCB

Washer-dryer shows E90; control panel may be unresponsive or display random symbols.

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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

Loose harness between UI and main board, Faulty user interface PCB, Faulty main control board, Software corruption

How to Fix / Troubleshooting

Safety: Unplug the appliance.

  • Power reset: Leave unplugged for 10–15 minutes, then reconnect and test.
  • Check connectors: Remove the control panel and ensure the ribbon cable or harness between the UI and main PCB is fully seated and undamaged.
  • Inspect for moisture: Look for signs of water ingress behind the control panel. Dry thoroughly if present.
  • Board replacement: If E90 persists, either the UI board or main PCB is faulty. Replacement usually requires a technician to program the new board correctly.
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Repair Difficulty

Professional Required 5/5

Required Part

User Interface PCB
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