E05
BYD
Input Overvoltage Protection
Charger displays E05 and refuses to start charging; sometimes occurs after a power outage or grid fluctuation.
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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
Supply voltage above BYD charger rated maximum, Incorrect supply configuration (e.g., 3‑phase feed to single‑phase unit), Loose neutral causing voltage imbalance, Faulty input voltage sensing circuit on main control PCB
How to Fix / Troubleshooting
Safety first: Overvoltage can damage the charger and vehicle. Do not bypass this protection.
- Measure supply voltage: Have a qualified electrician measure line-to-neutral and line-to-line voltages at the charger input while under light load.
- Verify correct phase configuration: Ensure a single-phase BYD charger is not connected across two phases of a 3‑phase supply unless specified by BYD.
- Check neutral connection: Loose or missing neutral can cause high voltage on one leg. Tighten connections at the distribution board (electrician only).
- Power-cycle after grid stabilization: If there was a recent surge or outage, turn off the breaker for 5 minutes, then restore power and test again.
- If voltages are normal but E05 persists: The input voltage sensing circuit on the main control PCB may be defective and require replacement.
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Repair Difficulty
Hard
4/5
Required Part
Main Control PCB
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