EV chargers fault codes by brand
Find your manufacturer below, then your fault. Most home chargepoints have no screen at all, so the fault is reported by the colour and pattern of a status light — each brand page decodes its own.
There is a live safety notice on some of these appliances
Some Easee One backplates sold between late September 2025 and 3 February 2026 carry a mislabelled terminal — marked L3 where it should read PME — which could lead to the charger’s PEN fault protection being bypassed.
Worth knowing because of the symptom: where a mislabelled unit is confirmed to be wired incorrectly without external PEN protection, charging is paused remotely until it is fixed. An Easee that has stopped for no obvious reason may have been paused deliberately.
Brands
Pick your manufacturer to see every code we cover.
Most looked-up ev charger codes
Across every brand in this category.
- Not charging on scheduleAll brandsAlmost certainly the law rather than a fault. Chargers are required to apply a random delay of up to ten minutes and to ship with a default off-peak schedule.Usually simple to fix
- Charger keeps trippingAll brandsDo not keep resetting it. UK chargepoints are required to detect a dangerous supply fault, and repeated tripping may be the charger reporting your electricity supply.Stop — call an engineer
- Red lightAll brandsDo not assume red means broken. Some manufacturers publish it as a stop condition; Ohme publish steady red on their Home and Go as connected and waiting for your car.Get it checked
- Cable stuck in the socketAll brandsAlarming and usually mechanical. The counterintuitive fix that manufacturers publish is to push the plug further in, not to pull harder.Get it checked
- Charging slower than expectedAll brandsUsually the charger sharing the house supply, a solar mode doing its job, or a CT clamp problem — Ohme publish a specific fallback to 16 amps.Usually simple to fix
- PEN Faultmyenergi zappiCode 29. The protection against loss of the supply earth-neutral conductor has operated, and myenergi tell you to remove the fault before resetting.Stop — call an engineer
- Flashing yellowOhmeOn a Home or Go this means an electrical fault, and all lights flashing together means the car. Steady red on these models is not a fault at all.Get it checked
- PE Faultmyenergi zappiCode 25. myenergi say the earth is either disconnected or its impedance is too high — a problem in the installation rather than in the charger.Stop — call an engineer
- OvervoltageOhmeAbove 253 volts or below 207, Ohme pause charging. Their published remedy sends you to your distribution network operator, not to Ohme.Get it checked
- RCD activationOhmeOhme build the residual current protection into the unit and publish the reset for it — one of very few owner actions any manufacturer in this category sanctions.Get it checked
- SelfTest Failedmyenergi zappiCode 27, searched as A27. The built-in protection devices could not be tested, or failed the test, before a charge. myenergi’s action is a reset; they do not say it cannot be repaired.Get it checked
- Charge Blockedmyenergi zappiNot a fault. The car keeps asking to charge after it already reported complete, and the zappi has stopped answering.Usually simple to fix
- Home Pro red lightOhmeOn a Home Pro the light strips turning red means error, and Ohme publish no code list behind it. Read the screen for the reason, power cycle once, and contact Ohme if it stays.Get it checked
- Lock Failuremyenergi zappiCode 23, and the fix is counter-intuitive: push the plug further in to release it. Untethered zappis only.Get it checked
- Overheatingmyenergi zappiTwo stages, both published: wavy lines over the zappi icon mean thermal limiting with reduced output, and the Overheating! message means the output is off. Ventilation is the remedy and charging resumes on its own.Get it checked
- Contactor Faultmyenergi zappiCode 28. myenergi say a relay inside the unit has welded, and that a second relay is holding the supply to your car isolated. Their action is one reset; if it returns, contact them.Get it checked
- Home Pro blue lightOhmeBlue on a Home Pro is delayed charging: the car is plugged in and Ohme is waiting for the scheduled or off-peak window. Solid green is plugged in, fading green is charging.Usually simple to fix
- Charger offlineOhmeAn Ohme that shows Connecting to the internet, Scanning cell towers or Trying to reconnect, or an ePod blinking orange, has lost its 4G link. Ohme’s remedy is a fifteen-minute power cycle.Usually simple to fix
- Bad Voltage Rangemyenergi zappiCode 31, shown with Over Voltage or Under Voltage. The mains supply is outside the range the zappi will charge on, so it has disconnected the car. The fault is upstream of the charger.Get it checked
- Comms Faultmyenergi zappiCode 26: the zappi cannot talk to its own built-in protection components. One reset is the published action; a repeat is a hardware fault inside the unit.Get it checked
Symptoms
No code on the display? Start from what it is doing.
EV charger not charging the car
Three separate things can each decide not to charge — the car, the chargepoint and the tariff app — and most of these faults are one of them following an instruction.EV charger tripping the electrics
A chargepoint that trips is reporting a fault it was fitted to detect, and one of the things it watches for is a supply failure that can make the car body live.
How ev chargers fault codes work
Home chargepoints report faults differently from everything else on this site, and the difference is the first thing to understand.
Most of them have no display. What they have is a status light, and the fault is in the colour and the flash pattern rather than in a code. That means the decoder matters more than the code list, and it is brand-specific: the same colour means different things on different units. Each brand page here carries whatever pattern decoder that manufacturer publishes, and says so plainly where they publish none. Where there is an app, it will usually give you a fuller message than the light does, and it is worth looking there before concluding anything.
The fault that surprises people most is earth-related. A UK home chargepoint has to protect against a fault on the incoming supply — a broken combined neutral and earth conductor, which can put dangerous voltage onto anything earthed in your house, including a car parked on the drive with a cable plugged into it. Chargepoints detect that condition and refuse to charge, and they are meant to. So a charger that trips out and will not start is often reporting something about your electricity supply rather than about itself, and repeatedly resetting it is the wrong response. If the same unit trips its RCD or RCBO more than once, stop and get it looked at rather than resetting it each evening.
Two other groups account for most of the rest. Lock faults leave the cable physically trapped in the socket, which is alarming and usually mechanical rather than electrical. And connectivity faults — the unit losing its link to the manufacturer's back office — often stop scheduled or off-peak charging while leaving the charger perfectly able to deliver power on demand. A charger that will not follow a cheap-rate schedule is a very different problem from one that will not charge at all, and it is worth establishing which you have before you ring anyone.
Solar diversion deserves a mention because it generates complaints that are not faults. If your charger is set to use surplus generation only, it will start, stop, and vary its rate as clouds pass, and it will do nothing at all on a dull day. That is the mode working. So is a charger throttling itself because load balancing has detected the oven and the shower running at the same time.
Finally, the legal position, stated accurately. Installing or altering a chargepoint is notifiable electrical work under Part P of the Building Regulations in England and Wales, and it is normally done by an electrician registered with a competent person scheme. That is not the same thing as gas work being criminally restricted, and we are not going to tell you it is — but it does mean the wiring side belongs to a qualified person, and that the person to call about a unit that keeps tripping is usually an electrician rather than the charger manufacturer.
Guides
EV charger not charging? The delay, the schedule, the light
A chargepoint that does nothing is usually obeying the smart charging rules. What they make it do, how to read the light against the app, and the two resets.EV charger tripping or showing an earth fault: what it means
A chargepoint that trips is usually reporting your electricity supply, not itself. Open-PEN detection, the voltage window, earth faults, RCDs and who to call.