Wallbox
Wallbox EV Home Chargers Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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Error 01
Charger will not start charging; app or LED indicates 'Error 01' immediately after plugging in the vehicle.
Internal Residual Current Device (RCD) / Ground Fault Detection Trip
Error 02
Charging session stops or will not start; Wallbox app or LED status shows 'Error 02' related to overcurrent or short circuit.
Output Overcurrent / Short Circuit Protection Trip
Error 03
Wallbox charger displays 'Error 03' and refuses to charge; often described as insulation or isolation fault.
Insulation Resistance / Isolation Fault on Output
Error 04
Wallbox unit shows 'Error 04' and does not initiate charging; often associated with contactor or relay failure.
Contactor / Relay Feedback Error
Error 05
Charging stops or will not start; Wallbox indicates 'Error 05', typically related to temperature.
Overtemperature Protection Triggered
Error 06
Wallbox shows 'Error 06' and does not charge; often associated with pilot signal or communication with vehicle.
Control Pilot (CP) Signal Fault
Error 07
Wallbox indicates 'Error 07'; charging is disabled and app may mention 'proximity' or 'plug detection' fault.
Proximity Pilot (PP) / Plug Detection Fault
Error 08
Wallbox shows 'Error 08' and refuses to charge; often related to supply voltage issues.
Input Voltage Out of Range
Error 09
Wallbox displays 'Error 09'; charging is disabled and may be associated with phase loss or phase imbalance.
Phase Loss / Phase Imbalance Detection
Error 10
Wallbox shows 'Error 10'; charger does not start and may reference internal communication failure.
Internal Communication Bus Error
Error 11
Wallbox indicates 'Error 11'; charging is disabled and app may mention 'lock' or 'access' issues.
Connector Locking Mechanism Fault
Error 12
Wallbox shows 'Error 12'; charger does not start and may reference RFID or user authentication failure.
RFID Reader / Access Control Fault
Error 13
Wallbox indicates 'Error 13'; charging is disabled and app may mention 'meter' or 'energy measurement' fault.
Internal Energy Meter / Current Sensor Fault
Error 14
Wallbox shows 'Error 14'; charger may still power on but cannot start charging; often linked to configuration or parameter errors.
Configuration / Parameter Validation Error
Error 15
Wallbox indicates 'Error 15'; charging is disabled and may reference 'load management' or 'power sharing' issues.
Dynamic Load Management / Power Sharing Communication Fault
Error 16
Wallbox shows 'Error 16'; charger may reboot repeatedly or stay offline; often related to power supply issues.
Internal Low‑Voltage Power Supply Fault
Error 17
Wallbox indicates 'Error 17'; app may mention 'ground connection' or 'PE fault'.
Protective Earth (PE) Connection Fault
Error 18
Wallbox shows 'Error 18'; charging is disabled and may be associated with external energy meter or CTs used for dynamic load management.
External Meter / CT Communication or Measurement Fault
Error 19
Wallbox indicates 'Error 19'; charger may be locked out and app references 'safety relay' or 'self‑test' failure.
Safety Self‑Test Failure (RCD / Contactor Test)
Error 20
Wallbox shows 'Error 20'; charger remains offline in the app and may not respond to remote commands.
Network Communication Fault (Wi‑Fi/Ethernet)
Symptom
Charging starts but stops after a few minutes; Wallbox shows normal status or briefly flashes a warning, then returns to standby.
Intermittent Charging / Session Dropout
Symptom
Wallbox charger does not recognize that a vehicle is plugged in; remains in idle state with no transition to 'connected'.
Plug Detection Failure
Symptom
Wallbox charger emits a burning smell or visible smoke during or shortly after starting a charge.
Overheating / Component Burnout
Symptom
Wallbox charger frequently disconnects from Wi‑Fi or loses connection to the app, but continues charging.
Unstable Network Connectivity
Symptom
Wallbox charger leaks water or shows condensation inside the transparent parts of the housing.
Water Ingress / Seal Failure
Symptom
Wallbox charger overheats; housing is very warm or hot and charging current is reduced or stopped, sometimes without a specific error code.
Thermal Derating / Overheating Without Code
Symptom
Wallbox charger randomly reboots during charging sessions without showing a specific error code.
Unexpected Reset / Power Instability
Symptom
Wallbox charger trips the upstream RCD/RCBO or breaker as soon as charging starts.
Nuisance Tripping / Earth Leakage or Overcurrent
Symptom
Wallbox charger’s app shows incorrect energy consumption or current values compared to an external meter.
Measurement Inaccuracy
Symptom
Wallbox charger’s cable or connector becomes very hot during charging, even at normal current levels.
Overheating Connector / High Contact Resistance
Symptom
Wallbox charger’s front LEDs or display do not work, but the unit still charges the vehicle.
Indicator / Display Failure
Symptom
Wallbox charger’s front touch buttons (if present) do not respond or respond intermittently.
User Interface / Touch Panel Fault
Symptom
Wallbox charger’s internal fan (if equipped) runs loudly or continuously, even at low load or when idle.
Cooling Fan Control or Bearing Wear
Symptom
Wallbox EV charger has no power at all; LEDs are off and it does not appear in the app.
No Mains Power / Input Supply Failure
Symptom
Wallbox EV charger makes unusual buzzing, humming, or clicking noises during operation.
Mechanical Noise from Contactor or Transformer
Symptom
Wallbox powers on but will not start charging; LEDs show ready state but vehicle does not draw current and no error code is displayed.
Charge Authorization / Standby Lockout
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| Error 01 |
Charger will not start charging; app or LED indicates 'Error 01' immediately after plugging in the vehicle.
|
Internal Residual Current Device (RCD) / Ground Fault Detection Trip | View Details |
| Error 02 |
Charging session stops or will not start; Wallbox app or LED status shows 'Error 02' related to overcurrent or short circuit.
|
Output Overcurrent / Short Circuit Protection Trip | View Details |
| Error 03 |
Wallbox charger displays 'Error 03' and refuses to charge; often described as insulation or isolation fault.
|
Insulation Resistance / Isolation Fault on Output | View Details |
| Error 04 |
Wallbox unit shows 'Error 04' and does not initiate charging; often associated with contactor or relay failure.
|
Contactor / Relay Feedback Error | View Details |
| Error 05 |
Charging stops or will not start; Wallbox indicates 'Error 05', typically related to temperature.
|
Overtemperature Protection Triggered | View Details |
| Error 06 |
Wallbox shows 'Error 06' and does not charge; often associated with pilot signal or communication with vehicle.
|
Control Pilot (CP) Signal Fault | View Details |
| Error 07 |
Wallbox indicates 'Error 07'; charging is disabled and app may mention 'proximity' or 'plug detection' fault.
|
Proximity Pilot (PP) / Plug Detection Fault | View Details |
| Error 08 |
Wallbox shows 'Error 08' and refuses to charge; often related to supply voltage issues.
|
Input Voltage Out of Range | View Details |
| Error 09 |
Wallbox displays 'Error 09'; charging is disabled and may be associated with phase loss or phase imbalance.
|
Phase Loss / Phase Imbalance Detection | View Details |
| Error 10 |
Wallbox shows 'Error 10'; charger does not start and may reference internal communication failure.
|
Internal Communication Bus Error | View Details |
| Error 11 |
Wallbox indicates 'Error 11'; charging is disabled and app may mention 'lock' or 'access' issues.
|
Connector Locking Mechanism Fault | View Details |
| Error 12 |
Wallbox shows 'Error 12'; charger does not start and may reference RFID or user authentication failure.
|
RFID Reader / Access Control Fault | View Details |
| Error 13 |
Wallbox indicates 'Error 13'; charging is disabled and app may mention 'meter' or 'energy measurement' fault.
|
Internal Energy Meter / Current Sensor Fault | View Details |
| Error 14 |
Wallbox shows 'Error 14'; charger may still power on but cannot start charging; often linked to configuration or parameter errors.
|
Configuration / Parameter Validation Error | View Details |
| Error 15 |
Wallbox indicates 'Error 15'; charging is disabled and may reference 'load management' or 'power sharing' issues.
|
Dynamic Load Management / Power Sharing Communication Fault | View Details |
| Error 16 |
Wallbox shows 'Error 16'; charger may reboot repeatedly or stay offline; often related to power supply issues.
|
Internal Low‑Voltage Power Supply Fault | View Details |
| Error 17 |
Wallbox indicates 'Error 17'; app may mention 'ground connection' or 'PE fault'.
|
Protective Earth (PE) Connection Fault | View Details |
| Error 18 |
Wallbox shows 'Error 18'; charging is disabled and may be associated with external energy meter or CTs used for dynamic load management.
|
External Meter / CT Communication or Measurement Fault | View Details |
| Error 19 |
Wallbox indicates 'Error 19'; charger may be locked out and app references 'safety relay' or 'self‑test' failure.
|
Safety Self‑Test Failure (RCD / Contactor Test) | View Details |
| Error 20 |
Wallbox shows 'Error 20'; charger remains offline in the app and may not respond to remote commands.
|
Network Communication Fault (Wi‑Fi/Ethernet) | View Details |
| – |
Charging starts but stops after a few minutes; Wallbox shows normal status or briefly flashes a warning, then returns to standby.
|
Intermittent Charging / Session Dropout | View Details |
| – |
Wallbox charger does not recognize that a vehicle is plugged in; remains in idle state with no transition to 'connected'.
|
Plug Detection Failure | View Details |
| – |
Wallbox charger emits a burning smell or visible smoke during or shortly after starting a charge.
|
Overheating / Component Burnout | View Details |
| – |
Wallbox charger frequently disconnects from Wi‑Fi or loses connection to the app, but continues charging.
|
Unstable Network Connectivity | View Details |
| – |
Wallbox charger leaks water or shows condensation inside the transparent parts of the housing.
|
Water Ingress / Seal Failure | View Details |
| – |
Wallbox charger overheats; housing is very warm or hot and charging current is reduced or stopped, sometimes without a specific error code.
|
Thermal Derating / Overheating Without Code | View Details |
| – |
Wallbox charger randomly reboots during charging sessions without showing a specific error code.
|
Unexpected Reset / Power Instability | View Details |
| – |
Wallbox charger trips the upstream RCD/RCBO or breaker as soon as charging starts.
|
Nuisance Tripping / Earth Leakage or Overcurrent | View Details |
| – |
Wallbox charger’s app shows incorrect energy consumption or current values compared to an external meter.
|
Measurement Inaccuracy | View Details |
| – |
Wallbox charger’s cable or connector becomes very hot during charging, even at normal current levels.
|
Overheating Connector / High Contact Resistance | View Details |
| – |
Wallbox charger’s front LEDs or display do not work, but the unit still charges the vehicle.
|
Indicator / Display Failure | View Details |
| – |
Wallbox charger’s front touch buttons (if present) do not respond or respond intermittently.
|
User Interface / Touch Panel Fault | View Details |
| – |
Wallbox charger’s internal fan (if equipped) runs loudly or continuously, even at low load or when idle.
|
Cooling Fan Control or Bearing Wear | View Details |
| – |
Wallbox EV charger has no power at all; LEDs are off and it does not appear in the app.
|
No Mains Power / Input Supply Failure | View Details |
| – |
Wallbox EV charger makes unusual buzzing, humming, or clicking noises during operation.
|
Mechanical Noise from Contactor or Transformer | View Details |
| – |
Wallbox powers on but will not start charging; LEDs show ready state but vehicle does not draw current and no error code is displayed.
|
Charge Authorization / Standby Lockout | View Details |
No matching codes found
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