E20
AEG
Mains Voltage or Frequency Out of Range
Microwave shows E20 and will not start; often after installation or moving the unit.
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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
Incorrect supply voltage, Loose mains connection block, Faulty mains filter board, Control PCB sensing error
How to Fix / Troubleshooting
Safety warning: Mains wiring must comply with local regulations. If unsure, use a qualified electrician.
- Step 1 – Verify supply: Check that the microwave is connected to the correct voltage (typically 230–240 V AC in Europe). Avoid using long extension leads.
- Step 2 – Inspect mains cable and plug: Look for damage, overheating, or loose pins. Replace the cable or plug if necessary.
- Step 3 – Check terminal block: For built-in AEG models hard-wired to a junction box, ensure all terminals are tight and correctly wired.
- Step 4 – Internal mains filter: With power disconnected, inspect the mains filter / interference suppression board for burn marks or cracked components. Replace if damaged.
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Repair Difficulty
Hard
4/5
Required Part
Mains Filter Board
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