Zaptec
Zaptec 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
Charging session will not start; vehicle shows ‘charging error’ and Zaptec app reports E01
Proximity / Pilot Signal Communication Fault
E02
Zaptec EV charger reports E02 and refuses to start charging; app indicates ‘Ground fault / earth leakage’
Residual Current Device (RCD) / Earth Leakage Trip
E03
Charger shows E03 and will not energize; app indicates ‘No PE / missing earth’
Protective Earth (PE) Conductor Fault
E04
Zaptec charger displays E04; app message: ‘Overcurrent / load exceeded’ and charging stops shortly after start
Overcurrent Protection Trip
E05
Charger shows E05; app indicates ‘Overvoltage on supply’ and charging is blocked
AC Supply Overvoltage Protection
E06
Zaptec charger reports E06; app message: ‘Undervoltage / low supply’ and charging does not start or stops
AC Supply Undervoltage Protection
E07
Charger shows E07; app indicates ‘Contactor fault / welded or open’ and unit will not charge
Main Contactor Failure
E08
Zaptec charger displays E08; app message: ‘Temperature too high’ and charging is reduced or stopped
Overtemperature Protection
E09
Charger shows E09; app indicates ‘Pilot signal error / CP out of range’ and vehicle will not charge
Control Pilot (CP) Signal Fault
E10
Zaptec charger reports E10; app message: 'Insulation resistance too low,' and charging is blocked.
Insulation Monitoring Device (IMD) Trip
E11
Charger shows E11; app indicates 'Phase sequence / phase loss error' on three-phase installation.
Phase Loss or Phase Rotation Fault
E12
Zaptec charger displays E12; app message: 'Internal communication error,' and the unit is offline or unresponsive.
Internal CAN / UART Communication Fault
E13
Charger shows E13; app indicates 'RFID reader error,' and RFID cards are not recognized.
RFID Authentication Module Fault
E14
Zaptec charger reports E14; app message: 'Locking actuator error,' and the plug cannot be locked or released.
Connector Locking Mechanism Failure
E15
Charger shows E15; app indicates 'Metering error / energy measurement fault,' and billing or load balancing may be disabled.
Internal Energy Meter Failure
E16
Zaptec charger displays E16; app message: 'Configuration error / invalid settings,' and charging is blocked.
Configuration / Parameter Fault
E17
Charger shows E17; app indicates 'Load balancing communication error' in multi-charger installation.
Load Balancing Bus Communication Fault
E18
Zaptec charger reports E18; app message: 'Network error / cloud connection failed,' and remote control is unavailable.
External Network Connectivity Fault
E19
Charger shows E19; app indicates 'DC fault current detected,' and charging is interrupted.
DC Residual Current Detection Trip
E20
Zaptec charger displays E20; app message: 'Firmware error / boot failure', and the unit does not start properly.
Firmware Bootloader / Software Corruption
Symptom
An unusual electrical smell (hot plastic or insulation) near the charger during or after charging, without visible damage yet.
Early-Stage Overheating of Internal Components
Symptom
Charger completely dead: no LEDs, no network connection, and the vehicle does not detect the charger.
No Power / Supply Failure
Symptom
Charging starts but stops after a few minutes without any visible error on the charger; the vehicle shows 'charging interrupted'.
Thermal Derating or Marginal Supply Voltage
Symptom
RFID cards intermittently fail to start or stop charging; they are sometimes recognized, sometimes ignored.
Intermittent RFID Reader Performance
Symptom
The charger enclosure becomes unusually hot to the touch during or after charging, even at moderate current.
Overheating Due to Poor Connections or Environment
Symptom
The charger frequently loses connection to the Zaptec cloud, but local charging continues normally.
Intermittent Cloud Connectivity
Symptom
The charger makes a loud clicking or buzzing noise during operation, even when not actively charging.
Noisy Contactor or Relay
Symptom
The charger powers on but is not visible in the Zaptec app and cannot be controlled remotely.
Local Network Connectivity Issue
Symptom
The charger randomly stops mid-session without any logged error; restarting usually resumes charging.
Intermittent Internal Power or Control Reset
Symptom
The charger trips the house RCD or breaker as soon as a vehicle is plugged in, but no specific charger error is logged.
External Protection Trip Under Load
Symptom
The charger’s LED or status indicator is dim, flickering, or completely off, but charging still works.
Status LED / Indicator Failure
Symptom
The charger’s Type 2 socket shows signs of melting, discoloration, or a burnt smell.
Overheated Connector / Contact Damage
Symptom
The charger’s enclosure or mounting bracket is loose, vibrating, or rattling when plugging or unplugging the cable.
Mechanical Mounting / Structural Issue
Symptom
The vehicle charges only at a very low current (e.g., 6–8 A) even though a higher current is configured and available.
Current Limitation Due to Configuration or Pilot Signal
Symptom
Vehicle will not start charging; no error code on the charger, LED appears normal, but the car reports 'charging not possible'.
Intermittent Pilot / Proximity Contact Issue
Symptom
Water or condensation visible inside or around the charger enclosure; intermittent charging issues in wet weather.
Moisture Ingress / Compromised Sealing
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Charging session will not start; vehicle shows ‘charging error’ and Zaptec app reports E01
|
Proximity / Pilot Signal Communication Fault | View Details |
| E02 |
Zaptec EV charger reports E02 and refuses to start charging; app indicates ‘Ground fault / earth leakage’
|
Residual Current Device (RCD) / Earth Leakage Trip | View Details |
| E03 |
Charger shows E03 and will not energize; app indicates ‘No PE / missing earth’
|
Protective Earth (PE) Conductor Fault | View Details |
| E04 |
Zaptec charger displays E04; app message: ‘Overcurrent / load exceeded’ and charging stops shortly after start
|
Overcurrent Protection Trip | View Details |
| E05 |
Charger shows E05; app indicates ‘Overvoltage on supply’ and charging is blocked
|
AC Supply Overvoltage Protection | View Details |
| E06 |
Zaptec charger reports E06; app message: ‘Undervoltage / low supply’ and charging does not start or stops
|
AC Supply Undervoltage Protection | View Details |
| E07 |
Charger shows E07; app indicates ‘Contactor fault / welded or open’ and unit will not charge
|
Main Contactor Failure | View Details |
| E08 |
Zaptec charger displays E08; app message: ‘Temperature too high’ and charging is reduced or stopped
|
Overtemperature Protection | View Details |
| E09 |
Charger shows E09; app indicates ‘Pilot signal error / CP out of range’ and vehicle will not charge
|
Control Pilot (CP) Signal Fault | View Details |
| E10 |
Zaptec charger reports E10; app message: 'Insulation resistance too low,' and charging is blocked.
|
Insulation Monitoring Device (IMD) Trip | View Details |
| E11 |
Charger shows E11; app indicates 'Phase sequence / phase loss error' on three-phase installation.
|
Phase Loss or Phase Rotation Fault | View Details |
| E12 |
Zaptec charger displays E12; app message: 'Internal communication error,' and the unit is offline or unresponsive.
|
Internal CAN / UART Communication Fault | View Details |
| E13 |
Charger shows E13; app indicates 'RFID reader error,' and RFID cards are not recognized.
|
RFID Authentication Module Fault | View Details |
| E14 |
Zaptec charger reports E14; app message: 'Locking actuator error,' and the plug cannot be locked or released.
|
Connector Locking Mechanism Failure | View Details |
| E15 |
Charger shows E15; app indicates 'Metering error / energy measurement fault,' and billing or load balancing may be disabled.
|
Internal Energy Meter Failure | View Details |
| E16 |
Zaptec charger displays E16; app message: 'Configuration error / invalid settings,' and charging is blocked.
|
Configuration / Parameter Fault | View Details |
| E17 |
Charger shows E17; app indicates 'Load balancing communication error' in multi-charger installation.
|
Load Balancing Bus Communication Fault | View Details |
| E18 |
Zaptec charger reports E18; app message: 'Network error / cloud connection failed,' and remote control is unavailable.
|
External Network Connectivity Fault | View Details |
| E19 |
Charger shows E19; app indicates 'DC fault current detected,' and charging is interrupted.
|
DC Residual Current Detection Trip | View Details |
| E20 |
Zaptec charger displays E20; app message: 'Firmware error / boot failure', and the unit does not start properly.
|
Firmware Bootloader / Software Corruption | View Details |
| – |
An unusual electrical smell (hot plastic or insulation) near the charger during or after charging, without visible damage yet.
|
Early-Stage Overheating of Internal Components | View Details |
| – |
Charger completely dead: no LEDs, no network connection, and the vehicle does not detect the charger.
|
No Power / Supply Failure | View Details |
| – |
Charging starts but stops after a few minutes without any visible error on the charger; the vehicle shows 'charging interrupted'.
|
Thermal Derating or Marginal Supply Voltage | View Details |
| – |
RFID cards intermittently fail to start or stop charging; they are sometimes recognized, sometimes ignored.
|
Intermittent RFID Reader Performance | View Details |
| – |
The charger enclosure becomes unusually hot to the touch during or after charging, even at moderate current.
|
Overheating Due to Poor Connections or Environment | View Details |
| – |
The charger frequently loses connection to the Zaptec cloud, but local charging continues normally.
|
Intermittent Cloud Connectivity | View Details |
| – |
The charger makes a loud clicking or buzzing noise during operation, even when not actively charging.
|
Noisy Contactor or Relay | View Details |
| – |
The charger powers on but is not visible in the Zaptec app and cannot be controlled remotely.
|
Local Network Connectivity Issue | View Details |
| – |
The charger randomly stops mid-session without any logged error; restarting usually resumes charging.
|
Intermittent Internal Power or Control Reset | View Details |
| – |
The charger trips the house RCD or breaker as soon as a vehicle is plugged in, but no specific charger error is logged.
|
External Protection Trip Under Load | View Details |
| – |
The charger’s LED or status indicator is dim, flickering, or completely off, but charging still works.
|
Status LED / Indicator Failure | View Details |
| – |
The charger’s Type 2 socket shows signs of melting, discoloration, or a burnt smell.
|
Overheated Connector / Contact Damage | View Details |
| – |
The charger’s enclosure or mounting bracket is loose, vibrating, or rattling when plugging or unplugging the cable.
|
Mechanical Mounting / Structural Issue | View Details |
| – |
The vehicle charges only at a very low current (e.g., 6–8 A) even though a higher current is configured and available.
|
Current Limitation Due to Configuration or Pilot Signal | View Details |
| – |
Vehicle will not start charging; no error code on the charger, LED appears normal, but the car reports 'charging not possible'.
|
Intermittent Pilot / Proximity Contact Issue | View Details |
| – |
Water or condensation visible inside or around the charger enclosure; intermittent charging issues in wet weather.
|
Moisture Ingress / Compromised Sealing | View Details |
No matching codes found
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