E20
Eureka
Internal Communication Bus Error
Robot displays E20; internal communication error between modules.
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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 ribbon cable between main board and sensor boards, Corroded connectors, Firmware incompatibility after update, Main board hardware fault
How to Fix / Troubleshooting
Safety first: Turn off the robot and remove the battery if accessible.
- Power cycle: Leave the robot powered off for several minutes, then restart.
- Firmware check: Connect to the Eureka app and ensure firmware is up to date. Reapply update if prompted.
- Advanced inspection: Experienced users can open the robot and gently reseat ribbon cables and connectors between the main PCB and sensor modules (LiDAR, bumper, Wi‑Fi, etc.).
- If E20 persists: The Main Control Board or a peripheral module may be defective. Professional diagnosis and board/module replacement are recommended.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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