Hager EV charger displays E20; app may show ‘isolation fault’ or ‘insulation resistance too low’. Charging is blocked.

Safety first: An insulation fault can cause electric shock. Do not use the charger until the cause is identified.

Steps to try:

• Dry the connector: If the charger or cable has been exposed to heavy rain or washing, disconnect and allow everything to dry thoroughly before retrying.
• Inspect cable and socket: Look for visible cuts, cracks, or burn marks on the cable and around the Type 2 socket. Replace damaged components.
• Test with another vehicle and cable: If E20 only occurs with one vehicle, the vehicle may have an insulation issue and should be checked by the dealer.
• Technician insulation test: A qualified electrician should perform insulation resistance tests on the charger’s output wiring and inspect for moisture ingress. Replace any damaged wiring, socket, or the insulation monitoring device/main board as required.