F20
AEG
Communication Error Between Main Board and Power Module
F20 error, oven may not start or may shut down when using certain functions.
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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 communication harness, oxidised connectors, failed power module, failed main control board
How to Fix / Troubleshooting
Safety first: Isolate the oven from mains before accessing internal components.
- Reseat connectors: Locate the low-voltage harness between the main control board and the power module. Disconnect and reconnect both ends, ensuring a firm fit.
- Inspect for damage: Look for pinched or chafed harness sections, especially where they pass near sharp metal edges.
- Check board mounting: Ensure both boards are securely mounted and not flexing, which can stress solder joints.
- Board substitution: If wiring is sound and F20 persists, one of the boards is defective. Replacement of the power module is usually attempted first, followed by the main board if needed.
Warning: Incorrect handling of boards can cause ESD damage. Use antistatic precautions.
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Repair Difficulty
Professional Required
5/5
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