F12
AEG
Low Voltage / Power Supply Fault
F12 error displayed, oven may be completely unresponsive or stuck in standby.
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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
Defective internal power supply on control board, loose mains terminal block, incorrect mains voltage, blown internal fuse on PCB
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker before opening any covers.
- Check mains supply: Verify that the correct voltage (typically 220–240 V AC in Europe) is present at the wall outlet and oven terminal block. Loose connections can cause undervoltage.
- Inspect terminal block: Remove the rear cover to access the mains terminal block. Tighten any loose screws and look for heat damage. Replace the block if melted or discoloured.
- Internal fuse: Some AEG control boards have a small glass or thermal fuse. If accessible, test for continuity and replace only with the same rating if blown.
- Control board replacement: If the power supply section of the board is faulty (bulging capacitors, burnt components), the entire board usually needs replacement.
Warning: Working on live mains circuits is hazardous. If you are unsure, seek professional service.
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Repair Difficulty
Hard
4/5
Required Part
Electronic Oven Control (EOC) Board
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