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 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 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 unit does not start properly
Firmware Bootloader / Software Corruption
Symptom
Charger completely dead: no LEDs, no network connection, vehicle does not detect charger
No Power / Supply Failure
Symptom
Charger enclosure becomes unusually hot to the touch during or after charging, even at moderate current
Overheating Due to Poor Connections or Environment
Symptom
Charger frequently loses connection to the Zaptec cloud but local charging continues normally
Intermittent Cloud Connectivity
Symptom
Charger makes a loud clicking or buzzing noise during operation, even when not actively charging
Noisy Contactor or Relay
Symptom
Charger powers on but is not visible in the Zaptec app and cannot be controlled remotely
Local Network Connectivity Issue
Symptom
Charger randomly stops mid-session without any logged error; restarting usually resumes charging
Intermittent Internal Power or Control Reset
Symptom
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
Charger’s enclosure or mounting bracket is loose, vibrating, or rattling when plugging/unplugging the cable
Mechanical Mounting / Structural Issue
Symptom
Charger’s LED or status indicator is dim, flickering, or completely off, but charging still works
Status LED / Indicator Failure
Symptom
Charger’s Type 2 socket shows signs of melting, discoloration, or burnt smell
Overheated Connector / Contact Damage
Symptom
Charging starts but stops after a few minutes without any visible error on the charger; vehicle shows ‘charging interrupted’
Thermal Derating or Marginal Supply Voltage
Symptom
RFID cards intermittently fail to start or stop charging; sometimes recognized, sometimes ignored
Intermittent RFID Reader Performance
Symptom
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
Vehicle charges only at a very low current (e.g., 6–8 A) even though higher current is configured and available
Current Limitation Due to Configuration or Pilot Signal
Symptom
Vehicle will not start charging; no error code on charger, LED appears normal but 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 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 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 unit does not start properly
|
Firmware Bootloader / Software Corruption | View Details |
| – |
Charger completely dead: no LEDs, no network connection, vehicle does not detect charger
|
No Power / Supply Failure | View Details |
| – |
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 |
| – |
Charger frequently loses connection to the Zaptec cloud but local charging continues normally
|
Intermittent Cloud Connectivity | View Details |
| – |
Charger makes a loud clicking or buzzing noise during operation, even when not actively charging
|
Noisy Contactor or Relay | View Details |
| – |
Charger powers on but is not visible in the Zaptec app and cannot be controlled remotely
|
Local Network Connectivity Issue | View Details |
| – |
Charger randomly stops mid-session without any logged error; restarting usually resumes charging
|
Intermittent Internal Power or Control Reset | View Details |
| – |
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 |
| – |
Charger’s enclosure or mounting bracket is loose, vibrating, or rattling when plugging/unplugging the cable
|
Mechanical Mounting / Structural Issue | View Details |
| – |
Charger’s LED or status indicator is dim, flickering, or completely off, but charging still works
|
Status LED / Indicator Failure | View Details |
| – |
Charger’s Type 2 socket shows signs of melting, discoloration, or burnt smell
|
Overheated Connector / Contact Damage | View Details |
| – |
Charging starts but stops after a few minutes without any visible error on the charger; vehicle shows ‘charging interrupted’
|
Thermal Derating or Marginal Supply Voltage | View Details |
| – |
RFID cards intermittently fail to start or stop charging; sometimes recognized, sometimes ignored
|
Intermittent RFID Reader Performance | View Details |
| – |
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 |
| – |
Vehicle charges only at a very low current (e.g., 6–8 A) even though 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 charger, LED appears normal but 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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