Charger displays E05 and refuses to start charging.

Safety first: Work with a licensed electrician for live voltage and load measurements.

• Check breaker and wire size: Verify the circuit breaker and conductor gauge match the charger’s installation manual. Undersized wire can cause excessive voltage drop.
• Measure voltage under load: Have an electrician measure voltage at the charger while attempting to start a charge. If voltage sags below the minimum rating, reduce load on the circuit or upgrade wiring.
• Inspect terminations: With power OFF, tighten all line and ground connections inside the charger and at the breaker panel.
• Dedicated circuit: Ensure the EV charger is on a dedicated circuit and not sharing with other large appliances.

If supply voltage is stable and within spec but E05 continues, the internal low-voltage power supply or sensing circuit on the control board may be failing and should be replaced.