E021
NewMotion
Real-Time Clock (RTC) / Time Synchronization Fault
Charger shows E021; LED ring is red; app indicates internal clock or time sync error.
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Possible Causes
Depleted RTC backup battery on PCB, Loss of NTP sync due to network issues, Corrupted time settings, Faulty RTC chip
How to Fix / Troubleshooting
Safety first: Isolate power before replacing any PCB.
- Check network: Ensure the charger has internet access so it can synchronize time via NTP. Fix any router or firewall issues blocking outbound connections.
- Manual time set: If supported, set the time and timezone manually via the installer interface.
- Firmware update: Update firmware to ensure the latest time sync logic is in place.
- PCB replacement: If the RTC chip or its backup battery on the main PCB has failed and cannot maintain time, replace the board.
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Repair Difficulty
Easy
2/5
Required Part
Main Control PCB (RTC Circuit)
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