E91
Amica Communication Error Between UI and Main PCB

Display panel lights but does not respond correctly; E91 displayed

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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 or damaged communication cable, Faulty user interface board, Faulty main PCB, Electrical noise or surge damage

How to Fix / Troubleshooting

Safety first: Unplug the appliance.

  • Reseat cables: Remove the top cover and control panel. Disconnect and reconnect the ribbon or harness between the UI and main PCB.
  • Inspect for damage: Look for burnt tracks or components on either board. Replace the damaged board.
  • Surge protection: After repair, consider using a surge protector to reduce future risk.
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Repair Difficulty

Hard 4/5

Required Part

Main Control Module (PCB)
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