E11
BYD
Phase Sequence / Phase Loss Error (for 3‑phase BYD chargers)
Charger displays E11 and will not start; often after incorrect wiring or installation changes.
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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
Incorrect phase rotation at supply, Missing one phase at input terminal block, Loose phase conductor, Faulty phase detection circuit on main control PCB
How to Fix / Troubleshooting
Safety first: 3‑phase wiring must be handled by a licensed electrician. Turn off the main breaker before inspection.
- Verify 3‑phase presence: An electrician should measure voltage between all three phases and to neutral at the charger input.
- Correct phase order: If the BYD manual specifies a phase sequence, swap phases at the distribution board to match.
- Tighten terminals: Ensure all phase conductors are firmly clamped in the charger’s input terminal block.
- Check for blown upstream fuses: Replace any blown fuses or tripped breakers feeding individual phases.
- If wiring is correct but E11 persists: The phase detection circuit on the main control PCB may be faulty and require replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control PCB
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