E12
BYD
Display / HMI Communication Fault
Charger shows E12 and the display may be blank or frozen; unit does not respond to button presses.
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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 display board and main control PCB, Failed HMI/display board, Firmware mismatch between HMI and main controller, Moisture damage to front panel PCB
How to Fix / Troubleshooting
Safety first: Disconnect power at the breaker before removing the front cover.
- Power-cycle: Turn off the breaker for 5 minutes, then restore power to see if the display recovers.
- Check for condensation: If the charger is outdoors, look for moisture behind the front panel. If present, allow to dry and improve weather protection.
- Professional inspection: A technician can open the front panel, reseat the display ribbon cable, and inspect for corrosion.
- Firmware check: BYD service may need to update or reflash HMI firmware to match the main controller.
- Replace HMI board if needed: If the display remains dead, replace the HMI/display PCB with a BYD-approved part.
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Repair Difficulty
Hard
4/5
Required Part
HMI / Display PCB
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