EV Charge Point Faults and Troubleshooting

Most home charge point faults are not faults at all. They are the equipment doing what it was designed to do: a protective device has tripped, the supply voltage has moved outside the range the charger will accept, or a smart charger has lost the network connection it needs before it will start a scheduled session. A charger that stops and shows an error when voltage goes beyond the acceptable range is behaving correctly, and that behaviour protects both the charger and the vehicle¹.

The first action is the same in almost every case. Speak to your installer or electrician to check there is not a problem with the equipment, and if the charger has latched into a voltage error, switch it off and on at the isolator switch¹. A separate restart route exists at the consumer unit: turn off the circuit breaker powering the charger, wait 30 seconds, then turn it back on².

What a householder should not do is open the unit. If an electric car charger is broken, the guidance is not to try to repair it yourself: it is a job for a professional electrician with the qualifications and certifications³. Everything below sets out what can be checked safely, what the common failure patterns look like, and where the boundary sits between a reset and a call-out.

First checks when your EV charger is not working

The order of checks matters, because the cheapest explanations are the most common. Start with the charger's own indication: a unit that will not function and displays a red ring or an error is telling you it has detected a supply condition it will not work through¹. That is not a fault code in the sense of a broken component; it is a refusal.

The second check is the isolator. Switching the charger off and on at the isolator switch is the documented recovery step for a voltage-related stop¹. The third is the consumer unit, where a dedicated protective device sits. Circuit breakers break a circuit when tripped by short-circuit issues or power overloads, so a breaker that has tripped is reporting an electrical event rather than a software glitch⁸.

The fourth check is the network. A smart charger that has dropped off Wi-Fi may not appear in its app and may not accept a scheduled charge. One maker's troubleshooting sequence for a charger missing from the app is to check the charger is powered on, connected to Wi-Fi, that Bluetooth is enabled on the phone and that the firmware update has completed successfully⁹.

Power supply and the dedicated circuit: why a tripped breaker stops charging

Every charge point should have its own circuit. The requirement is a separate MCB or RCBO at the distribution board for each charger, with no other loads sharing it¹¹. That separation is what makes diagnosis possible: if the charger's device trips and nothing else on the board does, the problem is on that circuit.

The circuit also carries the protective devices that make the installation safe. Where an EV charger has built-in DC fault current detection to 6mA, a Type A RCD at 30mA is sufficient¹¹. That matters for troubleshooting because an RCD that trips repeatedly is reporting a leakage or fault condition, and resetting it without finding the cause simply repeats the event.

Voltage is the other supply-side cause. Chargers operate within an acceptable voltage range, and if the voltage goes outside it the charger will stop working and show an error, a safety feature protecting the charger and the vehicle¹². Voltage drop or surge is a recognised cause of EV charger errors¹². This is not always a household problem: when neighbouring homes all export solar energy simultaneously, local network voltage rises, and some EV chargers respond by shutting down¹³.

Supply capacity is the deeper constraint. Homes sharing one electricity cable with a neighbour may not have a supply strong enough for an EV charger, and need a dedicated cable installed before the charger can go ahead¹⁴. In Northern Ireland the same position applies: a looped supply needs its own dedicated cable before the charger can proceed¹⁵. Where the supply cannot cope with new equipment, the network operator's process applies¹⁶.

Wi-Fi and smart features: when a disconnected charger will not start a charge

A smart charger is a networked appliance, and losing the network removes functions that a household may have come to rely on: scheduled charging, tariff-linked sessions, energy reporting and remote control. The connection requirement is specific. One maker's chargers connect only to a 2.4GHz Wi-Fi network, so a router that presents a single merged network name, or a 5GHz-only band, will not carry the charger².

Reconnection is done through the maker's app. The documented route is to select "Wi-Fi Settings" and follow the on-screen instructions to connect the charger to the new Wi-Fi network². That is the step to take after a router change or a broadband swap, and it is the step most often missed when a charger that worked for months stops accepting schedules.

Security and connectivity are linked on some units. One maker states its chargers can only be operated once the unique RFID card is swiped or the smart charging app is activated, so the household is protected from unauthorised use⁹. The trade-off is that a lost card or a failed app login is itself a reason a charge will not start, and it looks identical to a fault from the driver's seat.

The wider point for independence is that a cloud-linked charger depends on a manufacturer's servers, an app and a home network. The electricity comes from the grid as before, but the control layer sits with a company. Where the maker's platform changes or the app is withdrawn, the smart functions are the part at risk, not the charging circuit.

Weather and your charger: rain, cold and lightning

Chargers are built for outdoor mounting, and the certification regime tests for it. BSI Kitemark certification for EV chargers includes temperature testing in both very hot and very cold conditions, plus humidity and dust and water exposure testing¹⁷. Ordinary British rain is therefore inside the design envelope, and rain is not the mechanism behind a slow session.

Cold is. Charging takes longer in cold weather because extra power is needed to heat both the inside of the car and the battery, so it can take longer to charge¹⁸. That is a vehicle behaviour rather than a charger fault, and it is most visible on rapid charging, where the effect is described in those terms¹⁸.

Heat is the other end. An EV could lose charge if left out in the sun for too long¹⁹. For a home charger, the practical consequence is that a session which appears to have delivered less than expected may reflect conditions rather than a defect.

Lightning is a voltage event, and the charger's response to voltage events is already documented: outside the acceptable range it stops and shows an error¹². There is no separate thunderstorm rule in the guidance, and no compensation route for the interruption. SSEN states plainly that it does not provide specific compensation for being unable to charge an EV or export electricity from solar panels during a planned outage²⁰. That is the honest position on weather-related interruptions: the equipment protects itself, and the household absorbs the lost session.

Car and charger compatibility: why some pairings refuse to charge

Not every failure is at the charger end. Compatibility between vehicle and charge point accounts for a share of sessions that will not start, and the evidence from public charging shows how common connection problems are: in a survey of EV drivers who had to choose a different charging point, 42% could not connect, while 33% could not easily activate the charger²¹.

Connector type is the first variable. Some EV drivers may require a CHAdeMO or CCS charging adapter if the charging socket is not compatible with their EV, at ultra-rapid charge points²². At home the relevant connector is the one the vehicle accepts, and the choice between a tethered charger, which comes with a cable and connector installed, and an untethered charger, which has only a socket, follows from that³.

Plug-in hybrids sit outside part of the network by design. While PHEVs can use slow and fast public charging points, most are unable to utilise the growing network of rapid and ultra-rapid chargers²³. On rapid chargers specifically, most hybrid batteries do not support high-speed charging, so rapid chargers offer little benefit²⁴. A hybrid that will not accept a fast session is not faulty; it is outside its capability.

The emergency option is worth naming because it is sometimes mistaken for a fix. A UK 3-pin connector can be used to charge some EVs in an emergency but lacks the safety and speed of a dedicated charging point²⁵. It is not a substitute for a working home charger, and it is not a diagnostic tool.

Charging speeds and what counts as a fault: 3kW, 7kW and 22kW compared

Speed is the area where households most often mistake normal behaviour for a fault. A 7kW AC unit is the standard domestic power level, and for most homes a 7kW charger is a good choice, costing around £900 to buy and install⁴. A 22kW charger is the most expensive option and requires a three-phase connection⁴. Where a household has a single-phase supply, 22kW is not available at all, and a charger delivering 7kW is performing as specified.

The distinction between a slow session and a fault turns on what the vehicle asked for. A car that accepts only a lower rate will draw only that rate, and the charger will report a normal session. Cold weather extends the time a session takes because power is diverted to heating the cabin and the battery¹⁸. A scheduled session that stops early may have been curtailed by a smart charging platform responding to a tariff window or a network signal rather than by a hardware failure.

The independence question sits here too. A home charger at 7kW gives a household control over when and how fast it charges, subject to the supply capacity of the property and the vehicle's own acceptance rate. What it does not give is independence from the grid: the energy still arrives through the same connection, and the speed available is capped by the fuse and the network, not by the charger's label.

When to call a qualified electrician and what they must certify

The boundary is clear in the guidance. If an electric car charger is broken, do not try to repair it yourself: it is a job for a professional electrician with the qualifications and certifications³. Installation should always be done by a qualified and certified electrician⁵, and it is recommended to use a reputable company and ensure the installer has the relevant qualifications²⁶.

The competence standard is specific. To install EV chargers, an installer needs competence in the IET Code of Practice for Electric Vehicle Charging¹¹. Chargers should be installed by a registered electrician with experience in this type of installation⁶, and by a qualified electrician with relevant experience, with compatibility between the charger, solar system and any battery storage considered from the outset²⁷.

Certification is the household's protection. A compliance certificate proves the work complies with building regulations²⁶. Electricians registered on a Competent Person Scheme, such as NICEIC's, are deemed competent to self-certify their own work, saving householders time and money³. Hiring an electrician registered with a recognised certification body is the recommended route³.

The safety case for using a professional is not theoretical. A charging cable sold via eBay was recalled because the product presents a high risk of electric shock as it does not have a suitable earthing arrangement²⁸. A ROMADA New Energy EV Charger and Cable was the subject of a product safety report because the supplied plug is missing the required accreditation markings²⁹. Faults of this kind are not diagnosable by a householder and are not fixable by one.

Installation basics that explain many faults: DNO notification, surveys and certification

A proportion of faults trace back to the installation rather than the equipment, which is why the installer's obligations matter to a household trying to diagnose a problem. Under the IET Code of Practice, installers assess the adequacy of the supply capacity for the new EV's electricity consumption plus any existing demand, assess the adequacy of the earthing, and notify the electricity Distribution Network Operator once the charge point has been installed¹⁶.

Earthing is the obligation most likely to be behind an intermittent fault. The Easee One backplate safety report describes how incorrect labelling could cause an electrician to connect the PME conductor to the standard PE terminal instead of the dedicated PME terminal, potentially bypassing the charger's built-in PEN fault detection and automatic disconnection function required for UK PME installations¹⁰. That is an installation error with a safety consequence, and it is exactly the kind of issue a household cannot see.

Building regulations approval is always required when installing an EV home charger, and a competent and reputable installer should be used, with specific processes for notifying the local building control authority³⁰. Planning permission is a separate question and usually not needed: a domestic charger falls within permitted development rights where the home has off-street parking and the criteria are met³⁰. Permission is usually required for on-street parking, conservation areas, listed buildings, areas where installation is restricted, and more than one upstand per parking space³⁰.

Where a household has no off-street parking, or the charger sits less than two metres from the highway, planning permission is required³¹. Cross-pavement solutions carry their own regime: unless the crossing is owned by the Highways Authority, separate planning permission is needed, and a pavement cable crossing is unlikely to be covered under householder permission where it sits outside the curtilage of the building on highway pavement³². Permission from the Highways Authority is required for permanent pavement crossing solutions³³.

Grants and replacement costs: what funding is available if a charger needs replacing

Where a charger has to be replaced rather than reset, cost is the household's next question. A 7kW charger costs around £900 to buy and install⁴. A supply-only 7kW charger averages £625³⁴, and the average cost of installing a home EV charger has been reported at £1,000 in parts and labour³⁴. Prices are installer-quoted and vary with the cable run, the earthing arrangement and whether the consumer unit needs work.

Grant support exists for specific groups rather than for replacements generally. The Electric Vehicle chargepoint grant for households with on-street parking funds support towards the costs of the purchase and installation of EV chargepoints at residential properties when also installing a cross-pavement charging solution⁷. The Electric Vehicle chargepoint grant for renters and flat owners funds support towards the costs of the purchase and installation of EV charge points for drivers who are renters or own a flat⁷. All these grants offer eligible applicants up to 75% off the cost of installing an EV chargepoint⁶. Landlords and flat tenants are eligible for a government grant of up to £350 for home EV chargers, which can reduce the installation cost to as low as £650³⁴.

The independence picture for a replacement is the same as for a first installation. A grant reduces the capital cost but does not change the underlying position: the household still draws from the grid, still depends on a manufacturer for firmware and app support, and still needs a qualified electrician for any work on the circuit. What a working home charger does provide is control over timing and cost per mile, which is the part of energy independence a domestic charge point can actually deliver.