Heidelberg EV Home Chargers Error Codes

E01

Charging session does not start, vehicle shows ‘charging error’, charger display shows E01 immediately after plugging in.

Proximity Pilot / Control Pilot Communication Fault

E02

Charger shows E02 and refuses to start charging, vehicle does not lock the connector, relay clicking may be heard briefly.

Contactor / Relay Weld Detection or Stuck Contactor

E03

Charger displays E03, charging stops or will not start, often after a power fluctuation or grid disturbance.

Input Voltage Out of Range / Phase Detection Error

E04

Charger shows E04 and refuses to charge, sometimes accompanied by a tripped RCD/RCBO in the distribution board.

Insulation Fault / Ground Fault Detected

E05

Charger displays E05, fan may run briefly, then unit shuts down and will not start charging.

Overtemperature Protection / Thermal Shutdown

E06

Charger shows E06, no charging possible, often after a lightning storm or grid surge event.

Surge Protection / MOV Failure or Internal Power Supply Fault

E07

Charger displays E07, RFID card or app command is accepted but charging does not start, internal relay click may be absent.

Internal Power Module / Output Stage Fault

E08

Charger shows E08, charging stops shortly after starting, vehicle may show ‘charging interrupted’.

Overcurrent / Output Current Limit Exceeded

E09

Charger displays E09, Wi‑Fi or Ethernet LED may be off, remote control via app fails.

Communication Module Failure (Wi‑Fi/Ethernet/Modbus)

E10

Charger shows E10, RFID cards are not recognized, local authorization fails but basic charging may still work in open mode.

RFID Reader Failure

E11

Charger displays E11, load management with other Heidelberg chargers or building EMS fails, charging current not adjusted.

Load Management / Modbus Communication Error

E12

Charger shows E12, scheduled charging or time‑based functions do not operate correctly, internal clock resets after power loss.

Real‑Time Clock / Backup Power Failure

E13

Charger displays E13, charging stops when another high‑load appliance in the house turns on, or charger never reaches full configured current.

External Current Transformer (CT) / Dynamic Load Management Fault

E14

Charger shows E14, display or LEDs may flicker, unit may reboot repeatedly.

Low‑Voltage Power Supply Instability

E15

Charger displays E15, integrated energy meter readings are unavailable or show dashes, billing or logging fails.

Internal Energy Meter Communication Error

E16

Charger shows E16, vehicle reports ‘charging station error’, charging stops shortly after start.

Control Pilot Duty Cycle / PWM Signal Error

E17

Charger displays E17, integrated DC residual current protection test fails or cannot be initiated.

DC Residual Current Detection Self‑Test Failure

E18

Charger shows E18, access via app or web interface is blocked, local display may show ‘config locked’.

Configuration Lock / Parameter Corruption

E19

Charger displays E19, integrated door or cover switch error, unit refuses to charge with cover closed.

Enclosure Tamper / Cover Interlock Fault

E20

Charger shows E20, external release button or emergency stop is indicated as active, charging cannot start.

Emergency Stop / External Input Fault

Symptom

Charger does not start charging at scheduled times, but manual start works and no error code is displayed.

Scheduling / Timer Function Misconfiguration

Symptom

Charger enclosure vibrates noticeably when contactor pulls in or during charging, causing rattling noises.

Mechanical Vibration / Mounting Issues

Symptom

Charger housing feels warm to hot during long charging sessions, but no error code or shutdown occurs.

Normal Thermal Load vs. Marginal Ventilation

Symptom

Charger makes a loud humming or buzzing noise during charging, louder than usual, but continues to operate.

Acoustic Noise from Contactor or Power Electronics

Symptom

Charger randomly stops charging before the vehicle battery is full, no error code is displayed, charging can be restarted manually.

Intermittent Charging Interruption

Symptom

Charger trips the upstream RCD/RCBO as soon as charging starts, but the charger itself shows no specific error code.

Nuisance Tripping / Leakage Current Exceeding Upstream RCD

Symptom

Charger’s front LEDs or display do not light up at all, unit appears dead, but upstream breaker is on.

No Power / Internal Auxiliary Supply Failure

Symptom

Charger’s front panel buttons (start/stop, mode) do not respond or require excessive force, but LEDs still work.

Front Panel Keypad / Button Failure

Symptom

Charger’s integrated display is very dim or unreadable, while LEDs and charging function normally.

Display Backlight / LCD Failure

Symptom

Charger’s integrated energy readings seem inaccurate compared to an external meter, but no error code is shown.

Energy Measurement Drift / Calibration Issue

Symptom

Charger’s integrated fan runs at full speed constantly, even when not charging, without any error code.

Cooling Fan Control Anomaly

Symptom

Charger’s Wi‑Fi connection is unstable or frequently drops, but charging continues normally.

Wireless Connectivity Instability

Symptom

Charging cable gets unusually warm during charging, especially near the plug or strain relief, but no error code is shown.

Connector Overheating / High Contact Resistance

Symptom

Plastic housing or plug emits a noticeable burnt or chemical smell during or after charging.

Thermal Damage / Component Overheating

Symptom

Vehicle will not start charging, no error code on charger, LEDs show ready state but car reports ‘charging not possible’.

Vehicle Not Detected / Handshake Failure Without Code

Symptom

Water or condensation visible inside the charger housing or behind the transparent cover, but unit may still function.

Moisture Ingress / Compromised IP Protection