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EnergyFaults — error codes and troubleshooting for energy devices
EV ChargersPulsar Plus
Error 109

Wallbox

Wallbox Error 109

Supply voltage out of range

Severity

Moderate

Safe to continue?

No

Technician required?

Recommended

Last verified

September 2026

First safe check

Check the household panel for tripped breakers and whether other large loads behave normally.

What does Error 109 mean?

The app reports error 109 when the measured voltage between line and neutral is outside the acceptable operating range. Charging is blocked to avoid operating the vehicle charger on an out-of-range supply.

Which models use this code?

Verified for

  • Wallbox — Pulsar Plus

Most likely causes

01

Supply voltage outside the operating window

Manufacturer documented

The measured line-to-neutral voltage is outside acceptable limits.

02

Supply or wiring problem in the property

Possible

Loose neutrals or an unbalanced supply can produce out-of-range readings.

Safe checks you can perform

  1. 1

    Check the electrical panel

    Confirm no breaker feeding the charger has tripped. Do not open the panel beyond the user-accessible breakers.

  2. 2

    Involve an electrician

    Voltage out of range is a supply-side condition; measuring it requires a qualified electrician.

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?

Reset behaviour is not documented for this code. Use only the manufacturer-approved restart sequence described in the device manual, and treat a code that returns immediately as an unresolved fault rather than a reset problem.

Related symptoms

Not 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

    Errors 109 and 112 indicate the measured voltage between L1 and neutral is out of range.

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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.