Walli
Walli 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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E01
Charger will not start charging; app or LED indicates E01 immediately after plugging in vehicle.
Proximity Pilot (PP) / Control Pilot (CP) Signal Fault
E02
Charging session stops immediately with E02; LEDs show fault as soon as vehicle requests current.
Ground Fault / Residual Current Detection Trip
E03
Walli charger displays E03 and refuses to start; app may show 'Line/Neutral reversed or missing ground'.
Supply Wiring Polarity / Protective Earth Fault
E04
Charger shows E04 and does not energize; often logged as 'Overvoltage' in the Walli app.
Input Overvoltage Protection Trip
E05
Walli charger intermittently stops charging with E05; app log shows 'Undervoltage' or 'Low supply'.
Input Undervoltage / Brownout Detection
E06
Charger shows E06 shortly after starting; app may show 'Overcurrent' or 'Output overload'.
Output Overcurrent / Relay Protection Trip
E07
Walli charger displays E07 and refuses to start; app shows 'Contactor weld detection' or 'Relay stuck'.
Contactor Weld / Stuck Relay Detection
E08
Charger shows E08; app log indicates 'Ground impedance too high' or 'PE fault'.
Protective Earth Impedance / Ground Resistance Fault
E09
Walli charger displays E09; app shows 'Temperature too high' and charging stops.
Internal Overtemperature Protection
E10
Charger shows E10 and will not start; app may show 'Pilot short to ground' or 'CP short'.
Control Pilot Short Circuit to Ground
E11
Walli charger displays E11; app shows 'Pilot open circuit' or 'No CP signal'.
Control Pilot Open Circuit
E12
Charger shows E12; app indicates 'Proximity error' or 'PP fault'.
Proximity Pilot (PP) Resistor Fault
E13
Walli charger displays E13; app shows 'Lock fault' or 'Connector lock error' on socketed models.
Connector Locking Actuator Fault
E14
Charger shows E14; app indicates 'Communication error with vehicle' or 'EVSE‑EV comms fault'.
EV Communication / PWM Signal Fault
E15
Walli charger displays E15; app shows 'Wi‑Fi module error' or 'Network module fault'.
Internal Wi‑Fi / Communication Module Fault
E16
Charger shows E16; app indicates 'RFID reader error' or 'Authentication module fault' on RFID‑enabled models.
RFID Reader / Access Control Fault
E17
Walli charger displays E17; app shows 'OCPP server error' or 'Backend communication fault' on connected models.
Backend / OCPP Communication Fault
E18
Charger shows E18; app indicates 'Phase loss' or 'Phase imbalance' on three‑phase Walli models.
Phase Loss / Phase Imbalance Detection
E19
Walli charger displays E19; app shows 'Meter error' or 'Energy meter fault' on metered models.
Internal Energy Meter Communication Fault
E20
Charger shows E20; app indicates 'Load management error' or 'External CT fault' on systems with dynamic load balancing.
External Current Transformer (CT) / Load Management Fault
E21
Walli charger displays E21; app shows 'Internal memory error' or 'Configuration storage fault'.
Non‑Volatile Memory / Configuration Storage Fault
E22
Charger shows E22; app indicates 'Button panel error' or 'User interface fault' on models with physical buttons.
Front Panel / Keypad Communication Fault
E23
Walli charger displays E23; app shows 'Fan error' or 'Cooling system fault' on actively cooled models.
Internal Cooling Fan Fault
E24
Charger shows E24; app indicates 'DC leakage detected' on models with DC leakage monitoring.
DC Residual Current Detection Trip
E25
Walli charger displays E25; app shows 'Isolation fault' or 'Insulation resistance too low'.
Output Insulation Resistance Fault
E26
Charger shows E26; app indicates 'Time sync error' or 'RTC fault' on models with billing features.
Real‑Time Clock (RTC) / Timekeeping Fault
E27
Walli charger displays E27; app shows 'Overload on auxiliary output' on models with auxiliary relay outputs.
Auxiliary Output Overload / Short Circuit
E28
Charger shows E28; app indicates 'Firmware mismatch' between modules.
Module Firmware Version Mismatch
E29
Walli charger displays E29; app shows 'Internal power supply error'.
Low‑Voltage Power Supply Fault
E30
Charger shows E30; app indicates 'Unknown internal error' or 'Generic fault'.
Generic Internal Fault / Self‑Test Failure
Symptom
Walli charger causes lights in the house to flicker or dim when charging starts.
Excessive Voltage Drop / Supply Overload
Symptom
Walli charger emits a loud humming or buzzing noise during operation.
Mechanical Vibration / Magnetic Hum from Contactor or Transformer
Symptom
Walli charger energy readings in the app are clearly inaccurate compared to a separate meter.
Energy Meter Calibration / Measurement Error
Symptom
Walli charger front LEDs or display are very dim or flicker, but charging still works.
User Interface Power / LED Driver Degradation
Symptom
Walli charger is charging, but the cable and connector become excessively hot to the touch.
Overheating Connector / High Contact Resistance
Symptom
Walli charger is not visible in the Walli app or cannot be added to the account.
Local Connectivity / Pairing Failure
Symptom
Walli charger leaks water or shows condensation inside the transparent areas of the housing.
Enclosure Seal Failure / Moisture Ingress
Symptom
Walli charger makes a clicking sound repeatedly without starting a charge.
Contactor Chatter / Unstable Control Pilot
Symptom
Walli charger powers on but will not start charging; LEDs remain idle and no relay click is heard when plugging in the vehicle.
Charge Enable / Contactor Drive Failure
Symptom
Walli charger produces a burning smell or visible smoke during or after charging.
Overheating / Component Failure
Symptom
Walli charger RFID reader does not respond to cards or fobs, but no specific error is shown.
RFID Reader Non‑Responsive
Symptom
Walli charger scheduled charging does not start at the programmed time.
Scheduling / Timer Function Fault
Symptom
Walli charger starts charging but frequently stops mid‑session without a clear error code; charging resumes if restarted.
Intermittent Thermal or Supply Instability
Symptom
Walli charger trips the upstream RCD or breaker as soon as a charging session starts.
Nuisance Tripping / Real Ground Fault
Symptom
Walli EV charger has no power at all: no LEDs, no display, and not visible in the app.
No Mains Supply / Internal Power Loss
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Charger will not start charging; app or LED indicates E01 immediately after plugging in vehicle.
|
Proximity Pilot (PP) / Control Pilot (CP) Signal Fault | View Details |
| E02 |
Charging session stops immediately with E02; LEDs show fault as soon as vehicle requests current.
|
Ground Fault / Residual Current Detection Trip | View Details |
| E03 |
Walli charger displays E03 and refuses to start; app may show 'Line/Neutral reversed or missing ground'.
|
Supply Wiring Polarity / Protective Earth Fault | View Details |
| E04 |
Charger shows E04 and does not energize; often logged as 'Overvoltage' in the Walli app.
|
Input Overvoltage Protection Trip | View Details |
| E05 |
Walli charger intermittently stops charging with E05; app log shows 'Undervoltage' or 'Low supply'.
|
Input Undervoltage / Brownout Detection | View Details |
| E06 |
Charger shows E06 shortly after starting; app may show 'Overcurrent' or 'Output overload'.
|
Output Overcurrent / Relay Protection Trip | View Details |
| E07 |
Walli charger displays E07 and refuses to start; app shows 'Contactor weld detection' or 'Relay stuck'.
|
Contactor Weld / Stuck Relay Detection | View Details |
| E08 |
Charger shows E08; app log indicates 'Ground impedance too high' or 'PE fault'.
|
Protective Earth Impedance / Ground Resistance Fault | View Details |
| E09 |
Walli charger displays E09; app shows 'Temperature too high' and charging stops.
|
Internal Overtemperature Protection | View Details |
| E10 |
Charger shows E10 and will not start; app may show 'Pilot short to ground' or 'CP short'.
|
Control Pilot Short Circuit to Ground | View Details |
| E11 |
Walli charger displays E11; app shows 'Pilot open circuit' or 'No CP signal'.
|
Control Pilot Open Circuit | View Details |
| E12 |
Charger shows E12; app indicates 'Proximity error' or 'PP fault'.
|
Proximity Pilot (PP) Resistor Fault | View Details |
| E13 |
Walli charger displays E13; app shows 'Lock fault' or 'Connector lock error' on socketed models.
|
Connector Locking Actuator Fault | View Details |
| E14 |
Charger shows E14; app indicates 'Communication error with vehicle' or 'EVSE‑EV comms fault'.
|
EV Communication / PWM Signal Fault | View Details |
| E15 |
Walli charger displays E15; app shows 'Wi‑Fi module error' or 'Network module fault'.
|
Internal Wi‑Fi / Communication Module Fault | View Details |
| E16 |
Charger shows E16; app indicates 'RFID reader error' or 'Authentication module fault' on RFID‑enabled models.
|
RFID Reader / Access Control Fault | View Details |
| E17 |
Walli charger displays E17; app shows 'OCPP server error' or 'Backend communication fault' on connected models.
|
Backend / OCPP Communication Fault | View Details |
| E18 |
Charger shows E18; app indicates 'Phase loss' or 'Phase imbalance' on three‑phase Walli models.
|
Phase Loss / Phase Imbalance Detection | View Details |
| E19 |
Walli charger displays E19; app shows 'Meter error' or 'Energy meter fault' on metered models.
|
Internal Energy Meter Communication Fault | View Details |
| E20 |
Charger shows E20; app indicates 'Load management error' or 'External CT fault' on systems with dynamic load balancing.
|
External Current Transformer (CT) / Load Management Fault | View Details |
| E21 |
Walli charger displays E21; app shows 'Internal memory error' or 'Configuration storage fault'.
|
Non‑Volatile Memory / Configuration Storage Fault | View Details |
| E22 |
Charger shows E22; app indicates 'Button panel error' or 'User interface fault' on models with physical buttons.
|
Front Panel / Keypad Communication Fault | View Details |
| E23 |
Walli charger displays E23; app shows 'Fan error' or 'Cooling system fault' on actively cooled models.
|
Internal Cooling Fan Fault | View Details |
| E24 |
Charger shows E24; app indicates 'DC leakage detected' on models with DC leakage monitoring.
|
DC Residual Current Detection Trip | View Details |
| E25 |
Walli charger displays E25; app shows 'Isolation fault' or 'Insulation resistance too low'.
|
Output Insulation Resistance Fault | View Details |
| E26 |
Charger shows E26; app indicates 'Time sync error' or 'RTC fault' on models with billing features.
|
Real‑Time Clock (RTC) / Timekeeping Fault | View Details |
| E27 |
Walli charger displays E27; app shows 'Overload on auxiliary output' on models with auxiliary relay outputs.
|
Auxiliary Output Overload / Short Circuit | View Details |
| E28 |
Charger shows E28; app indicates 'Firmware mismatch' between modules.
|
Module Firmware Version Mismatch | View Details |
| E29 |
Walli charger displays E29; app shows 'Internal power supply error'.
|
Low‑Voltage Power Supply Fault | View Details |
| E30 |
Charger shows E30; app indicates 'Unknown internal error' or 'Generic fault'.
|
Generic Internal Fault / Self‑Test Failure | View Details |
| – |
Walli charger causes lights in the house to flicker or dim when charging starts.
|
Excessive Voltage Drop / Supply Overload | View Details |
| – |
Walli charger emits a loud humming or buzzing noise during operation.
|
Mechanical Vibration / Magnetic Hum from Contactor or Transformer | View Details |
| – |
Walli charger energy readings in the app are clearly inaccurate compared to a separate meter.
|
Energy Meter Calibration / Measurement Error | View Details |
| – |
Walli charger front LEDs or display are very dim or flicker, but charging still works.
|
User Interface Power / LED Driver Degradation | View Details |
| – |
Walli charger is charging, but the cable and connector become excessively hot to the touch.
|
Overheating Connector / High Contact Resistance | View Details |
| – |
Walli charger is not visible in the Walli app or cannot be added to the account.
|
Local Connectivity / Pairing Failure | View Details |
| – |
Walli charger leaks water or shows condensation inside the transparent areas of the housing.
|
Enclosure Seal Failure / Moisture Ingress | View Details |
| – |
Walli charger makes a clicking sound repeatedly without starting a charge.
|
Contactor Chatter / Unstable Control Pilot | View Details |
| – |
Walli charger powers on but will not start charging; LEDs remain idle and no relay click is heard when plugging in the vehicle.
|
Charge Enable / Contactor Drive Failure | View Details |
| – |
Walli charger produces a burning smell or visible smoke during or after charging.
|
Overheating / Component Failure | View Details |
| – |
Walli charger RFID reader does not respond to cards or fobs, but no specific error is shown.
|
RFID Reader Non‑Responsive | View Details |
| – |
Walli charger scheduled charging does not start at the programmed time.
|
Scheduling / Timer Function Fault | View Details |
| – |
Walli charger starts charging but frequently stops mid‑session without a clear error code; charging resumes if restarted.
|
Intermittent Thermal or Supply Instability | View Details |
| – |
Walli charger trips the upstream RCD or breaker as soon as a charging session starts.
|
Nuisance Tripping / Real Ground Fault | View Details |
| – |
Walli EV charger has no power at all: no LEDs, no display, and not visible in the app.
|
No Mains Supply / Internal Power Loss | View Details |
No matching codes found
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