Charger shows E15; app indicates ‘Metering error / energy measurement fault’ and billing or load balancing may be disabled

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Faulty internal kWh meter IC, Loose CT or voltage sense wiring, Firmware mismatch with meter hardware, Main control board failure

Safety first: This fault usually does not stop charging but may affect billing and load control accuracy.

Steps:

Check app readings: Compare the charger’s reported power with the vehicle’s display. Large discrepancies suggest a metering issue.
Power-cycle: Turn the breaker OFF for 2 minutes, then ON, and recheck.
Technician inspection: Verify CT connections and voltage sense wiring on the main board. Reseat connectors.
If unresolved: Replace the main control board or dedicated metering module, depending on design.

Hard 4/5

Internal Energy Meter / Main Control Board

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