E20
Yarbo
Main Control Board Self‑Test Failure
Robot mower displays E20 and will not start; message may indicate main board error or internal fault.
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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, Internal short or component failure on main PCB, Moisture damage to control board
How to Fix / Troubleshooting
Safety: Turn OFF the mower and disconnect from the charging dock before opening any covers.
- Power reset: Turn the main power switch OFF for at least 60 seconds, then ON again. Attempt to start the mower.
- Check for moisture: Inspect the control board compartment for signs of water ingress, condensation, or corrosion. Dry the area thoroughly if moisture is present.
- Firmware update: If the mower can still communicate with the Yarbo app, check for and install any available firmware updates.
- Visual inspection: Look for burnt components or damaged connectors on the main board. Do not touch components while powered.
If E20 persists, the Yarbo Main Control Board is likely defective and should be replaced by a qualified technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Yarbo Main Control Board
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