E020
Siemens
Internal Communication Bus Error
Oven displays E020 and will not start any program
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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
Faulty communication between display PCB and power PCB, Loose harness connectors, Control board hardware failure
How to Fix / Troubleshooting
Safety: Turn off power at the breaker before opening the appliance.
- Power reset: Isolate the oven for 10–15 minutes, then restore power. If E020 returns immediately, proceed.
- Check harness connections: Remove the top cover and control panel. Reseat all multi-pin connectors between the display board and main power board.
- Inspect for damage: Look for signs of overheating, cracked solder joints, or corrosion on both boards.
- Board replacement: If no obvious wiring issue is found and E020 persists, one or both control boards may require replacement. Use the exact Siemens part numbers for your model.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Module and/or Display PCB
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