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EV ChargersPulsar Plus
Error 103

Wallbox

Wallbox Error 103

DC leakage detected

Severity

High

Safe to continue?

No

Technician required?

Recommended

Last verified

September 2026

First safe check

Restart the charger once; if error 103 returns, leave the unit unplugged and contact the manufacturer.

What does Error 103 mean?

The app reports error 103 when DC leakage has been detected inside the charger. A restart is the initial documented step, but DC leakage is a safety-related condition: if the code reappears, the unit must not be used until it is inspected.

Which models use this code?

Verified for

  • Wallbox — Pulsar Plus

Most likely causes

01

DC leakage inside the charger

Manufacturer documented

The unit measured leakage current on the DC side.

02

Vehicle-side insulation condition

Possible

A vehicle-side condition can contribute to leakage readings.

Safe checks you can perform

  1. 1

    Restart once only

    A single documented restart is the permitted user action.

  2. 2

    Do not continue using the charger

    Treat a repeated leakage error as a safety condition and keep the unit out of service.

These steps stay outside the enclosure. Never open high-voltage equipment, bypass safety devices or work on live wiring.

When to stop troubleshooting

Stop and contact a qualified technician if the fault returns immediately, the device smells burnt, visible wiring damage exists, the enclosure is hot to the touch, or the manufacturer specifies professional service.

Can a reset clear this fault?

Documented reset behaviour: sometimes. Use only the manufacturer-approved restart sequence for this device and never bridge or bypass a safety mechanism to clear a fault.

Related symptoms

Red light on chargerNot charging at all

Related fault codes

3 red blinksThermal throttle; current reduced8 red flashesConfigured current incompatible with vehicleRed flashesFault detected; charging haltedSolid blue (over 15 minutes)Soft ground fault detectedSolid red LEDFault detected; station will not chargeError 101Connection or internal error

Sources

  • Wallbox Support — App Error Codes

    View
    Manufacturer
    Wallbox
    Document version
    —
    Section / page
    App error codes
    Verified
    September 2026

    Error 103 indicates DC leakage was detected and restarting the unit is the initial step.

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Disclaimer

EnergyFaults provides informational troubleshooting guidance. Electrical and high-voltage equipment should only be serviced by qualified professionals where required. Always follow the manufacturer documentation for your exact model.