E7
AEG Display / User Interface Communication Fault

Freezer displays E7 and may show incorrect temperature or alarm frequently

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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 connection between display PCB and main PCB, Damaged communication harness, Faulty display board, Faulty main control board communication circuit

How to Fix / Troubleshooting

Safety: Unplug the freezer before removing the control panel or top cover.

Steps:

  • 1. Inspect control fascia: Remove the front control panel or top trim (depending on model) to access the display PCB and connectors.
  • 2. Reseat connectors: Carefully unplug and replug the ribbon cable or harness between the display and main board. Ensure connectors are fully latched.
  • 3. Check for moisture: Look for signs of condensation or liquid ingress around the display. Dry gently and consider sealing any obvious gaps.
  • 4. Inspect harness: Follow the cable route to the main PCB. Look for pinched, cut, or abraded sections and repair as needed.
  • 5. Visual check of PCBs: Examine both display and main boards for burnt components, cracked solder joints, or corrosion.
  • 6. Replace faulty board: If reseating and harness repair do not clear E7, replace the display PCB first (most common), then the main PCB if the fault persists.

Note: Board-level repairs should be done by qualified technicians to avoid further damage.

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Repair Difficulty

Medium 3/5

Required Part

Display Control PCB
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