Ohme
Ohme 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
Ohme home charger will not start charging; app shows E01 and vehicle does not draw any current.
Proximity / Pilot Signal Fault
E02
Ohme charger reports E02 and refuses to energise; vehicle shows 'charging fault' or no charging.
Contactor / Relay Welded or Stuck
E03
Ohme charger displays E03 and will not start charging; app may show 'Earth fault' or 'Ground fault detected'.
Earth Fault / Residual Current Detection Trip
E04
Ohme charger shows E04 and refuses to charge; app may indicate 'Overcurrent' or 'Current sensor fault'.
Overcurrent / Current Sensor Fault
E05
Ohme charger displays E05; app may show 'Overvoltage' and charging is blocked.
Input Overvoltage Protection Trip
E06
Ohme charger shows E06; app may indicate 'Undervoltage' or 'Low supply voltage'. Charging does not start or stops unexpectedly.
Input Undervoltage Detection
E07
Ohme charger displays E07 and will not charge; app may show 'Temperature fault' or 'Overtemperature'.
Internal Overtemperature Protection
E08
Ohme charger shows E08; app may indicate 'PEN fault' or 'Earth monitoring fault' and charging is disabled.
PEN Conductor / Earth Monitoring Fault
E09
Ohme charger displays E09; app may show 'Isolation fault' or 'Insulation resistance low'.
Insulation Resistance / Isolation Monitoring Fault
E10
Ohme charger shows E10; app may indicate 'Contactor feedback fault' or 'Relay feedback error'.
Contactor Feedback / Position Monitoring Fault
E11
Ohme charger displays E11; app may show 'CP error' or 'Control pilot fault'.
Control Pilot Signal Out of Range
E12
Ohme charger shows E12; app may indicate 'Proximity error' or 'PP fault'.
Proximity Pilot (PP) Detection Fault
E13
Ohme charger displays E13; app may show 'Wi‑Fi error' or 'Network module fault'. Charging may still work but smart features fail.
Wi‑Fi / Network Module Communication Fault
E14
Ohme charger shows E14; app may indicate 'OCPP server error' or 'Backend communication fault'.
Backend / Cloud Communication Failure
E15
Ohme charger displays E15; app may show 'Firmware error' or 'Software fault'. Charger may reboot repeatedly.
Firmware Corruption / Software Exception
E16
Ohme charger shows E16; app may indicate 'RTC error' or 'Clock fault'. Schedules may run at incorrect times.
Real-Time Clock (RTC) / Timekeeping Fault
E17
Ohme charger displays E17; app may show 'Meter error' or 'Energy metering fault'.
Internal Energy Meter / CT Measurement Fault
E18
Ohme charger shows E18; app may indicate 'Load management error' or 'CT clamp fault' when using dynamic load balancing.
External CT Clamp / Load Balancing Fault
E19
Ohme charger displays E19; app may show 'Locking mechanism fault' or 'Socket lock error' on socketed units.
Type 2 Socket Locking Actuator Fault
E20
Ohme charger shows E20; app may indicate 'Display error' or 'HMI fault'. Screen may be blank or frozen.
Display / HMI Communication Fault
Symptom
Ohme charger appears online but the Ohme app cannot control it reliably; commands are delayed or fail.
Unstable Network Connectivity
Symptom
Ohme charger does not follow scheduled charging times correctly; starts too early, too late, or not at all.
Scheduling / Time Synchronisation Issue
Symptom
Ohme charger emits a burning smell or visible smoke during or after charging.
Internal Overheating / Component Failure
Symptom
Ohme charger emits a loud humming or buzzing noise during charging.
Noisy Contactor or Transformer Vibration
Symptom
Ohme charger enclosure is loose on the wall or moves when the cable is pulled.
Mechanical Mounting Failure
Symptom
Ohme charger is charging but the tethered cable or plug becomes excessively hot to the touch.
Overheating Connector / High Contact Resistance
Symptom
Ohme charger powers on but will not start charging; vehicle shows 'charging stopped' with no specific error code on the charger.
EVSE–Vehicle Handshake Failure
Symptom
Ohme charger starts charging but stops after a few minutes with no clear error code; vehicle may show 'charging interrupted'.
Intermittent Supply or Thermal Cut-Out
Symptom
Ohme charger trips the upstream MCB/RCBO or RCD as soon as charging starts.
Short Circuit or Earth Leakage Under Load
Symptom
Ohme charger’s cable does not retract or coil neatly; kinks and twists make it hard to plug in.
Cable Management / Mechanical Strain
Symptom
Ohme charger’s front LEDs or display backlight are on, but the screen is blank or unreadable.
Display Backlight Only / Data Line Failure
Symptom
Ohme charger’s internal fan (if fitted) runs loudly or continuously, even when not charging.
Cooling Fan Control or Sensor Fault
Symptom
Ohme charger’s RFID or start/stop button (if fitted) is unresponsive.
User Interface Button / RFID Reader Failure
Symptom
Ohme charger’s Type 2 socket cover or flap is broken or will not close properly (socketed models).
Mechanical Socket Cover Damage
Symptom
Ohme EV home charger has no power at all; no LEDs or display, and the app shows the charger as offline.
No Mains Supply to Charger
Symptom
Water or condensation visible on or inside the Ohme charger casing; intermittent charging or unexplained trips.
Moisture Ingress / IP Seal Failure
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Ohme home charger will not start charging; app shows E01 and vehicle does not draw any current.
|
Proximity / Pilot Signal Fault | View Details |
| E02 |
Ohme charger reports E02 and refuses to energise; vehicle shows 'charging fault' or no charging.
|
Contactor / Relay Welded or Stuck | View Details |
| E03 |
Ohme charger displays E03 and will not start charging; app may show 'Earth fault' or 'Ground fault detected'.
|
Earth Fault / Residual Current Detection Trip | View Details |
| E04 |
Ohme charger shows E04 and refuses to charge; app may indicate 'Overcurrent' or 'Current sensor fault'.
|
Overcurrent / Current Sensor Fault | View Details |
| E05 |
Ohme charger displays E05; app may show 'Overvoltage' and charging is blocked.
|
Input Overvoltage Protection Trip | View Details |
| E06 |
Ohme charger shows E06; app may indicate 'Undervoltage' or 'Low supply voltage'. Charging does not start or stops unexpectedly.
|
Input Undervoltage Detection | View Details |
| E07 |
Ohme charger displays E07 and will not charge; app may show 'Temperature fault' or 'Overtemperature'.
|
Internal Overtemperature Protection | View Details |
| E08 |
Ohme charger shows E08; app may indicate 'PEN fault' or 'Earth monitoring fault' and charging is disabled.
|
PEN Conductor / Earth Monitoring Fault | View Details |
| E09 |
Ohme charger displays E09; app may show 'Isolation fault' or 'Insulation resistance low'.
|
Insulation Resistance / Isolation Monitoring Fault | View Details |
| E10 |
Ohme charger shows E10; app may indicate 'Contactor feedback fault' or 'Relay feedback error'.
|
Contactor Feedback / Position Monitoring Fault | View Details |
| E11 |
Ohme charger displays E11; app may show 'CP error' or 'Control pilot fault'.
|
Control Pilot Signal Out of Range | View Details |
| E12 |
Ohme charger shows E12; app may indicate 'Proximity error' or 'PP fault'.
|
Proximity Pilot (PP) Detection Fault | View Details |
| E13 |
Ohme charger displays E13; app may show 'Wi‑Fi error' or 'Network module fault'. Charging may still work but smart features fail.
|
Wi‑Fi / Network Module Communication Fault | View Details |
| E14 |
Ohme charger shows E14; app may indicate 'OCPP server error' or 'Backend communication fault'.
|
Backend / Cloud Communication Failure | View Details |
| E15 |
Ohme charger displays E15; app may show 'Firmware error' or 'Software fault'. Charger may reboot repeatedly.
|
Firmware Corruption / Software Exception | View Details |
| E16 |
Ohme charger shows E16; app may indicate 'RTC error' or 'Clock fault'. Schedules may run at incorrect times.
|
Real-Time Clock (RTC) / Timekeeping Fault | View Details |
| E17 |
Ohme charger displays E17; app may show 'Meter error' or 'Energy metering fault'.
|
Internal Energy Meter / CT Measurement Fault | View Details |
| E18 |
Ohme charger shows E18; app may indicate 'Load management error' or 'CT clamp fault' when using dynamic load balancing.
|
External CT Clamp / Load Balancing Fault | View Details |
| E19 |
Ohme charger displays E19; app may show 'Locking mechanism fault' or 'Socket lock error' on socketed units.
|
Type 2 Socket Locking Actuator Fault | View Details |
| E20 |
Ohme charger shows E20; app may indicate 'Display error' or 'HMI fault'. Screen may be blank or frozen.
|
Display / HMI Communication Fault | View Details |
| – |
Ohme charger appears online but the Ohme app cannot control it reliably; commands are delayed or fail.
|
Unstable Network Connectivity | View Details |
| – |
Ohme charger does not follow scheduled charging times correctly; starts too early, too late, or not at all.
|
Scheduling / Time Synchronisation Issue | View Details |
| – |
Ohme charger emits a burning smell or visible smoke during or after charging.
|
Internal Overheating / Component Failure | View Details |
| – |
Ohme charger emits a loud humming or buzzing noise during charging.
|
Noisy Contactor or Transformer Vibration | View Details |
| – |
Ohme charger enclosure is loose on the wall or moves when the cable is pulled.
|
Mechanical Mounting Failure | View Details |
| – |
Ohme charger is charging but the tethered cable or plug becomes excessively hot to the touch.
|
Overheating Connector / High Contact Resistance | View Details |
| – |
Ohme charger powers on but will not start charging; vehicle shows 'charging stopped' with no specific error code on the charger.
|
EVSE–Vehicle Handshake Failure | View Details |
| – |
Ohme charger starts charging but stops after a few minutes with no clear error code; vehicle may show 'charging interrupted'.
|
Intermittent Supply or Thermal Cut-Out | View Details |
| – |
Ohme charger trips the upstream MCB/RCBO or RCD as soon as charging starts.
|
Short Circuit or Earth Leakage Under Load | View Details |
| – |
Ohme charger’s cable does not retract or coil neatly; kinks and twists make it hard to plug in.
|
Cable Management / Mechanical Strain | View Details |
| – |
Ohme charger’s front LEDs or display backlight are on, but the screen is blank or unreadable.
|
Display Backlight Only / Data Line Failure | View Details |
| – |
Ohme charger’s internal fan (if fitted) runs loudly or continuously, even when not charging.
|
Cooling Fan Control or Sensor Fault | View Details |
| – |
Ohme charger’s RFID or start/stop button (if fitted) is unresponsive.
|
User Interface Button / RFID Reader Failure | View Details |
| – |
Ohme charger’s Type 2 socket cover or flap is broken or will not close properly (socketed models).
|
Mechanical Socket Cover Damage | View Details |
| – |
Ohme EV home charger has no power at all; no LEDs or display, and the app shows the charger as offline.
|
No Mains Supply to Charger | View Details |
| – |
Water or condensation visible on or inside the Ohme charger casing; intermittent charging or unexplained trips.
|
Moisture Ingress / IP Seal Failure | View Details |
No matching codes found
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