E20
Einhell
Software / Firmware Error
Robot lawnmower shows E20 and will not start; often after firmware update or power surge.
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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
Corrupted firmware, Interrupted update process, Mainboard memory fault, Incompatible firmware version loaded
How to Fix / Troubleshooting
Safety first: Turn OFF the mower and disconnect it from the charging station before connecting any programming tools.
- Power cycle: Turn the main switch OFF for at least 60 seconds, then ON again. Sometimes a full reset clears temporary software faults.
- Factory reset: If the menu is accessible, perform a factory reset according to the Einhell user manual. Note that this may erase custom settings.
- Reapply firmware: If Einhell provides firmware updates via USB or service tool, reload the correct firmware version for your model, following official instructions carefully.
- Check for update interruptions: Ensure that any previous update was not interrupted by power loss. If it was, a full reflash by a service center may be required.
- Mainboard replacement: If E20 persists after software recovery attempts, the mainboard memory may be defective and the board should be replaced.
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Repair Difficulty
Professional Required
5/5
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