E9 displayed, unit may shut down or run erratically, sometimes accompanied by flickering display

Safety: Disconnect from mains before inspecting the rear of the appliance. Do not open sealed electronic modules if you are not qualified.

Steps:

• 1. Verify outlet: Test the wall socket with another appliance or a voltage tester to ensure stable voltage within the specified range.
• 2. Check power cord: Inspect the AEG power cord for cuts, kinks, or burn marks. Ensure the plug fits firmly in the outlet.
• 3. Avoid extension leads: Plug the wine cooler directly into a wall outlet. Long or undersized extension cords can cause voltage drop.
• 4. Inspect rear power module: Remove the rear service panel and locate any line filter or power entry module. Check for signs of overheating or loose connections.
• 5. Control board power section: If accessible, visually inspect the low-voltage section of the main PCB (transformer or switching supply). Swollen capacitors or burnt components indicate failure.
• 6. Replacement: If the internal power supply is faulty, the main control board or power module must be replaced with the correct AEG part. This is best done by a professional due to mains voltage risks.