Wallbox shows E05 and does not charge; often associated with incorrect supply voltage or phase configuration.

Warning: Mains voltage measurements must only be performed by a qualified electrician.

• Power‑cycle the charger: Turn off the supply breaker for 2–3 minutes, then restore power and check if E05 clears.
• Check installation documentation: Verify that the charger model (single‑phase vs three‑phase) matches the supply type and that the breaker and cable sizes are correct.
• Have an electrician measure voltages: A professional should measure line‑to‑neutral and line‑to‑line voltages at the wallbox supply terminals and confirm correct phase rotation for three‑phase models.
• Correct any wiring errors: If a phase is missing, neutral is not connected where required, or phases are mis‑assigned, the electrician must correct the wiring and retighten all terminals.
• If supply is correct: The internal voltage sensing circuit on the main control board may be defective and the board will need replacement.