E20
Grundig
General Control Board Fault
Oven display shows generic fault code, no specific function indicated, oven disabled
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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
Internal microcontroller error, corrupted firmware, severe power surge damage, multiple sensor faults detected simultaneously
How to Fix / Troubleshooting
Safety first: Disconnect the oven from mains power before any inspection.
- Power cycle: Leave the oven disconnected for at least 10 minutes to fully discharge capacitors. Reconnect and see if the error clears.
- Check for other symptoms: Note whether any fans, lights, or relays operate when attempting to start the oven. This can help a technician diagnose the board.
- Inspect PCB: Remove the control board and look for obvious damage: burnt areas, cracked solder joints, or blown components.
- Surge protection: If the fault followed a power outage or lightning, consider installing a surge protector for the oven circuit after repair.
- Replace control board: In most cases, a persistent general fault requires replacement of the main control board with the exact Grundig part number.
Warning: Firmware reprogramming or chip-level repair should only be done by qualified electronics specialists.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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