Charger shows E016; unit may still power on but refuses to charge any vehicle.

Safety first: Isolation faults can indicate a shock hazard. Turn OFF the breaker immediately and do not use the charger until inspected.

• 1. Inspect enclosure for moisture: Look for condensation, water trails, or rust inside the charger. If moisture is present, allow the unit to dry completely in a warm, dry environment.
• 2. Check cable entry points: Ensure that conduit fittings and cable glands are tight and properly sealed to prevent water ingress.
• 3. Clean debris: If you see dust or insect debris on the circuit boards, gently blow it away with dry compressed air. Do not use liquids.
• 4. Professional testing: Isolation monitoring circuits are safety-critical and require specialized test equipment. Have a qualified EVSE technician perform insulation resistance tests and replace the control board if necessary.