Zaptec charger reports E10; app message: ‘Insulation resistance too low’ and charging is blocked

Safety first: Low insulation resistance indicates a potential shock hazard. Do not bypass this protection.

Steps:

• Unplug vehicle and cable: Remove all external connections and power-cycle the charger. If E10 clears with no cable connected, suspect the cable or vehicle.
• Drying: If the charger or socket has been exposed to heavy rain or washing, allow it to dry naturally for 24 hours before retesting.
• Test with another vehicle/cable: If E10 only appears with one specific car or cable, that item likely has an insulation fault.
• Technician checks: Perform insulation resistance tests on the charger’s output wiring and internal components. If wiring is sound, replace the insulation monitoring module or main control board, depending on design.