E022
EVBox
External Meter Communication Fault
Charger displays E022; app indicates external energy meter communication error (for load balancing with external meter).
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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
Disconnected or miswired Modbus/RS‑485 cable to external meter, Incorrect meter address or protocol settings, Failed external meter, Faulty communication port on EVBox
How to Fix / Troubleshooting
Safety: External meters may be in the main distribution board; only qualified persons should access them.
- Check meter power: Ensure the external meter is powered and its display is active.
- Verify wiring: With power off, inspect the RS‑485/Modbus wiring between the EVBox and the meter for correct polarity and secure terminations.
- Address and protocol: In the EVBox installer settings, confirm that the meter model, address, baud rate, and parity match the external meter configuration.
- Test bus: If possible, connect a Modbus tester or another device to verify communication with the meter.
- If E022 persists: Replace the external meter or EVBox communication port as indicated by test results.
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Repair Difficulty
Hard
4/5
Required Part
External Modbus Energy Meter
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