E11
Zaptec
Phase Loss or Phase Rotation Fault
Charger shows E11; app indicates ‘Phase sequence / phase loss error’ on three-phase installation
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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
Missing phase at supply, Incorrect phase rotation (L1-L2-L3 swapped), Loose terminal on one phase, Faulty phase detection circuit on main board
How to Fix / Troubleshooting
Safety first: Three-phase miswiring can damage equipment. Only qualified electricians should modify phase connections.
Steps:
- Check supply breaker(s): Ensure all three phases feeding the charger are ON and not tripped.
- Technician verification: Measure voltage between all phase pairs and to neutral. Confirm all phases are present and within tolerance.
- Correct phase rotation: If the charger requires a specific phase order, swap phases at the distribution board or charger terminal block as per Zaptec installation manual.
- If wiring is correct: The phase detection circuit on the main control board may be faulty and require replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board (Phase Detection Circuit)
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