Charger shows E19; internal self-test reports insulation resistance error; charging is disabled.

Safety first: Turn OFF power and do not use the charger until the insulation fault is resolved. Risk of electric shock.

• 1. Check for moisture ingress: Inspect the exterior for cracks, missing gaskets, or open knockouts. If the unit has been exposed to heavy rain or flooding, water may be inside.
• 2. Open and inspect (qualified only): With power OFF, remove the cover and look for condensation, water droplets, or corrosion on boards and wiring. If present, disconnect power and allow the unit to dry in a warm, dry environment for 24–48 hours.
• 3. Clean contamination: If you see dust mixed with moisture or carbon tracks on the PCB, clean gently with isopropyl alcohol and a soft brush. Allow to dry completely.
• 4. Inspect wiring insulation: Look for nicks, cuts, or melted insulation on internal conductors. Replace any damaged wires or harnesses.
• 5. Persistent E19: If the unit is dry and visually clean but E19 remains, the insulation monitoring circuit on the main control board may be faulty and the board should be replaced.

When to call a professional: Insulation resistance testing should be performed by a qualified electrician or EVSE technician using appropriate test equipment.