E20
Roborock
Wireless Module / Communication Fault
Vacuum shows E20; Wi‑Fi or app icon flashes and app cannot connect to the vacuum.
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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
Wi‑Fi module firmware error, Corrupted pairing data, Faulty wireless PCB, Interference or weak signal
How to Fix / Troubleshooting
Safety first: Wireless issues do not usually involve high voltage, but always power off the unit before opening any covers.
- Reset network settings: Follow the user manual to reset Wi‑Fi (often by holding a specific button combination until a tone or LED pattern appears).
- Re-pair in app: Remove the device from the Roborock app, then add it again following the on-screen instructions.
- Check signal: Move closer to the router and avoid thick walls or metal obstacles during pairing.
- Firmware update: If possible, update the vacuum firmware via the app once connected.
- Hardware replacement: If E20 persists and the Wi‑Fi module is on a separate board, replace the Wi‑Fi Module PCB. If integrated, the Main Control PCB may need replacement.
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Repair Difficulty
Medium
3/5
Required Part
Wi‑Fi Module PCB / Main Control PCB
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