E19
AEG Low-Voltage Communication / Bus Error Between Boards

E19 displayed, interior light may flicker or stay on, door alarm behavior abnormal

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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 communication harness between UI and main board, Damaged data cable, Electrical noise or surge damage, Faulty microcontroller on one of the boards

How to Fix / Troubleshooting

Safety: Disconnect mains power before handling internal wiring or boards.

Steps:

  • 1. Access both boards: Remove the front control panel and rear main board cover.
  • 2. Inspect communication cable: Identify the multi-core cable or ribbon that links the UI to the main board. Check for kinks, cuts, or burn marks.
  • 3. Reseat connectors: Unplug and firmly reconnect both ends of the communication cable.
  • 4. Check for corrosion: Look for green/white deposits on connector pins. Clean gently or replace the harness if badly corroded.
  • 5. Replace harness: If physical damage is found, install a new OEM AEG communication harness.
  • 6. Board replacement: If E19 persists with a good harness, one of the boards (UI or main) may be defective and require replacement.
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Repair Difficulty

Hard 4/5

Required Part

UI-to-Main Board Harness
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