United Chargers
United Chargers 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; display shows E01 immediately after plugging into the vehicle.
Proximity / Pilot Signal Fault
E02
Charger displays E02 and refuses to energize; vehicle does not begin charging.
Ground Fault / Leakage Current Detected
E03
Display shows E03 and charging stops or will not start.
Contactor / Relay Welded or Stuck
E04
Charger shows E04 and does not charge; may occur intermittently during sessions.
Overvoltage on Supply Line
E05
Charger displays E05 and refuses to start charging.
Undervoltage / Brownout Detected
E06
E06 appears on the display; charger stops charging shortly after start.
Overtemperature Protection Triggered
E07
Charger shows E07 and does not recognize that a vehicle is connected.
Vehicle Detection / Proximity Circuit Error
E08
E08 error appears; charger attempts to start then immediately stops.
Pilot Duty Cycle / Current Setting Error
E09
Charger displays E09 and will not charge; may be accompanied by a tripped breaker.
Internal Short Circuit / Hardware Failure
E10
E10 appears and the charger cannot communicate with the vehicle; charging does not start.
EV Communication / State Transition Error
E11
Charger shows E11 and refuses to start; often after a configuration change or power outage.
Configuration / Calibration Error
E12
E12 error; charger display is on but unresponsive or frozen, and charging cannot be started.
User Interface / HMI Communication Failure
E13
Charger shows E13 and refuses to start charging when connected to networked services.
Network / Backend Authorization Error
E14
E14 appears; charger indicates a ground connection problem and will not charge.
Protective Earth (PE) Fault / Ground Loss
E15
Charger shows E15 and stops charging; may occur when multiple loads are active in the home.
Load Management / Overcurrent Limit Exceeded
E16
E16 error; charger reports internal communication failure between modules.
Internal Bus / Module Communication Error
E17
Charger shows E17 and immediately stops when a vehicle is connected; may indicate polarity or wiring issue.
Line Wiring / Polarity Error
E18
E18 appears; charger indicates insulation resistance or isolation fault.
Insulation Monitoring / Isolation Fault
E19
Charger shows E19 and refuses to start; often associated with RFID or user authentication issues.
Local Access Control Error
E20
E20 error; charger indicates a time synchronization or clock error affecting scheduled charging.
Real-Time Clock / Time Sync Error
Symptom
Breaker trips immediately or shortly after starting a charge session.
Overcurrent / Short Under Load
Symptom
Burning smell or visible smoke from the charger during or after charging.
Overheating / Component Burnout
Symptom
Charger cable insulation feels sticky, cracked, or excessively stiff, especially in cold weather.
Cable Jacket Degradation
Symptom
Charger enclosure vibrates or rattles when contactor engages or during charging.
Mechanical Vibration / Loose Mounting
Symptom
Charger has no power at all; display is blank and no LEDs are lit.
No AC Supply / Internal Power Loss
Symptom
Charger is physically hot to the touch during or after charging, even in moderate ambient temperatures.
Overheating of Enclosure or Internal Components
Symptom
Charger leaks water from the bottom of the enclosure after rain or washing the car nearby.
Enclosure Leak / Improper Sealing
Symptom
Charger makes a loud buzzing or chattering noise when charging.
Noisy Contactor / Coil Vibration
Symptom
Charger randomly reboots or restarts during charging sessions.
Unexpected Power Cycling / Reset
Symptom
Charging starts but stops randomly after a few minutes without any error code.
Intermittent Charge Interruption
Symptom
Display is very dim, flickering, or unreadable, but charging still works.
Display Backlight / HMI Degradation
Symptom
Ground-fault circuit interrupter (GFCI) or RCD upstream trips when charging starts, but the charger shows no error.
Nuisance Ground Fault Tripping
Symptom
J1772 connector is difficult to insert or remove from the vehicle inlet.
Mechanical Connector Wear / Deformation
Symptom
RFID cards are not recognized; charger does not respond when a card is presented.
RFID Reader Non-Responsive
Symptom
Scheduled charging does not start at the programmed time, but manual charging works.
Scheduling / Timer Malfunction
Symptom
Vehicle does not start charging; charger appears normal with no error code displayed.
No Charge Start / Pilot Not Recognized
Symptom
Water or condensation visible inside the charger enclosure or on the display window.
Moisture Ingress / Seal Failure
Symptom
Wi-Fi connection is unstable or the charger frequently drops offline from the app.
Unstable Wireless Connectivity
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Charger will not start charging; display shows E01 immediately after plugging into the vehicle.
|
Proximity / Pilot Signal Fault | View Details |
| E02 |
Charger displays E02 and refuses to energize; vehicle does not begin charging.
|
Ground Fault / Leakage Current Detected | View Details |
| E03 |
Display shows E03 and charging stops or will not start.
|
Contactor / Relay Welded or Stuck | View Details |
| E04 |
Charger shows E04 and does not charge; may occur intermittently during sessions.
|
Overvoltage on Supply Line | View Details |
| E05 |
Charger displays E05 and refuses to start charging.
|
Undervoltage / Brownout Detected | View Details |
| E06 |
E06 appears on the display; charger stops charging shortly after start.
|
Overtemperature Protection Triggered | View Details |
| E07 |
Charger shows E07 and does not recognize that a vehicle is connected.
|
Vehicle Detection / Proximity Circuit Error | View Details |
| E08 |
E08 error appears; charger attempts to start then immediately stops.
|
Pilot Duty Cycle / Current Setting Error | View Details |
| E09 |
Charger displays E09 and will not charge; may be accompanied by a tripped breaker.
|
Internal Short Circuit / Hardware Failure | View Details |
| E10 |
E10 appears and the charger cannot communicate with the vehicle; charging does not start.
|
EV Communication / State Transition Error | View Details |
| E11 |
Charger shows E11 and refuses to start; often after a configuration change or power outage.
|
Configuration / Calibration Error | View Details |
| E12 |
E12 error; charger display is on but unresponsive or frozen, and charging cannot be started.
|
User Interface / HMI Communication Failure | View Details |
| E13 |
Charger shows E13 and refuses to start charging when connected to networked services.
|
Network / Backend Authorization Error | View Details |
| E14 |
E14 appears; charger indicates a ground connection problem and will not charge.
|
Protective Earth (PE) Fault / Ground Loss | View Details |
| E15 |
Charger shows E15 and stops charging; may occur when multiple loads are active in the home.
|
Load Management / Overcurrent Limit Exceeded | View Details |
| E16 |
E16 error; charger reports internal communication failure between modules.
|
Internal Bus / Module Communication Error | View Details |
| E17 |
Charger shows E17 and immediately stops when a vehicle is connected; may indicate polarity or wiring issue.
|
Line Wiring / Polarity Error | View Details |
| E18 |
E18 appears; charger indicates insulation resistance or isolation fault.
|
Insulation Monitoring / Isolation Fault | View Details |
| E19 |
Charger shows E19 and refuses to start; often associated with RFID or user authentication issues.
|
Local Access Control Error | View Details |
| E20 |
E20 error; charger indicates a time synchronization or clock error affecting scheduled charging.
|
Real-Time Clock / Time Sync Error | View Details |
| – |
Breaker trips immediately or shortly after starting a charge session.
|
Overcurrent / Short Under Load | View Details |
| – |
Burning smell or visible smoke from the charger during or after charging.
|
Overheating / Component Burnout | View Details |
| – |
Charger cable insulation feels sticky, cracked, or excessively stiff, especially in cold weather.
|
Cable Jacket Degradation | View Details |
| – |
Charger enclosure vibrates or rattles when contactor engages or during charging.
|
Mechanical Vibration / Loose Mounting | View Details |
| – |
Charger has no power at all; display is blank and no LEDs are lit.
|
No AC Supply / Internal Power Loss | View Details |
| – |
Charger is physically hot to the touch during or after charging, even in moderate ambient temperatures.
|
Overheating of Enclosure or Internal Components | View Details |
| – |
Charger leaks water from the bottom of the enclosure after rain or washing the car nearby.
|
Enclosure Leak / Improper Sealing | View Details |
| – |
Charger makes a loud buzzing or chattering noise when charging.
|
Noisy Contactor / Coil Vibration | View Details |
| – |
Charger randomly reboots or restarts during charging sessions.
|
Unexpected Power Cycling / Reset | View Details |
| – |
Charging starts but stops randomly after a few minutes without any error code.
|
Intermittent Charge Interruption | View Details |
| – |
Display is very dim, flickering, or unreadable, but charging still works.
|
Display Backlight / HMI Degradation | View Details |
| – |
Ground-fault circuit interrupter (GFCI) or RCD upstream trips when charging starts, but the charger shows no error.
|
Nuisance Ground Fault Tripping | View Details |
| – |
J1772 connector is difficult to insert or remove from the vehicle inlet.
|
Mechanical Connector Wear / Deformation | View Details |
| – |
RFID cards are not recognized; charger does not respond when a card is presented.
|
RFID Reader Non-Responsive | View Details |
| – |
Scheduled charging does not start at the programmed time, but manual charging works.
|
Scheduling / Timer Malfunction | View Details |
| – |
Vehicle does not start charging; charger appears normal with no error code displayed.
|
No Charge Start / Pilot Not Recognized | View Details |
| – |
Water or condensation visible inside the charger enclosure or on the display window.
|
Moisture Ingress / Seal Failure | View Details |
| – |
Wi-Fi connection is unstable or the charger frequently drops offline from the app.
|
Unstable Wireless Connectivity | View Details |
No matching codes found
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