F40
AEG
Mains Supply / Phase Detection Error
F40 error, oven does not start and may show a power or phase-related warning.
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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 wiring (single vs three-phase), missing neutral, reversed live/neutral, low mains voltage, internal supply detection fault
How to Fix / Troubleshooting
Safety first: Turn off power at the distribution board. Only qualified persons should work on fixed wiring.
- Verify connection: Check the oven’s terminal block against the wiring diagram on the rear cover. Ensure links are correctly fitted for single-phase or multi-phase installation as specified by AEG.
- Check neutral and earth: Confirm that neutral and earth are correctly connected and secure.
- Measure voltage: With a multimeter (by a qualified person), verify correct voltage between phases and neutral.
- Internal fault: If external wiring is correct, the internal phase detection circuit on the control board may be faulty and require board replacement.
Warning: Incorrect mains wiring is dangerous and can damage the oven. Use a licensed electrician if in doubt.
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Repair Difficulty
Professional Required
5/5
Required Part
Electronic Oven Control (EOC) Board
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