E028
EVBox
Access Control Logic Fault
Charger displays E028; app indicates access control error; RFID or app authorization fails even with valid credentials.
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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 user database, Backend authorization service unreachable, Firmware bug in access control module, Faulty memory storing RFID IDs
How to Fix / Troubleshooting
Note: Access control faults may prevent starting sessions even though hardware is fine.
- Test offline mode: If supported, switch the charger to offline/open mode in the installer settings to see if charging works without authorization.
- Sync with backend: Ensure the charger is online and can reach the EVBox backend so that user lists and tokens can sync.
- Re‑register cards: Remove and re‑add RFID cards or app users via the portal.
- Firmware update: Install the latest firmware if an access control bug is known.
- If E028 persists: A main board memory fault may be present; replace the main control board.
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Repair Difficulty
Medium
3/5
Required Part
EVBox Main Control Board
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