EV Chargers Are Reliable — But Not Maintenance-Free

Home EV chargers are solid, well-engineered pieces of equipment. They have no moving parts, no consumables to replace, and no scheduled servicing requirements. Most owners install a charger and never think about it again — they plug in, charge, and unplug, night after night, without issue.

But like any electrical equipment exposed to the British weather and daily use, things can occasionally go wrong. And when they do, it helps to understand what is happening before you call an electrician — because some problems are simple to fix yourself, while others need professional attention.

This guide covers the most common EV charger problems, how to troubleshoot them, and what maintenance you should do to keep your charger running reliably for years.

Problem 1: The Charger Will Not Start Charging

You plug in the cable, but nothing happens — no lights, no charging, no response from the charger.

Check the basics first

Is the charger powered? Check whether the charger has power by looking at the status lights or display. If the charger is completely dead (no lights at all), check the consumer unit — the MCB for the charger circuit may have tripped. If it has, reset it and try again. If it trips again immediately, there is a fault that needs professional investigation.

Is the RCD tripped? EV charger circuits are protected by an RCD (residual current device) which trips if it detects a fault current to earth. Check the RCD at the consumer unit — if it has tripped, reset it and try again. Occasional RCD trips can be caused by moisture ingress, transient faults, or DC fault currents. Frequent trips indicate a genuine fault.

Is the cable properly connected? Check both ends of the cable — at the charger (for untethered units) and at the car. A cable that is not fully seated will not make a proper connection and the charger will not start. Push the connector firmly until it clicks.

Is the car ready to charge? Some EVs have their own scheduling settings that can prevent charging at certain times. Check the car’s infotainment system or app to make sure it is not set to delay charging.

Is the charger scheduled? Smart chargers have scheduling functions that can prevent charging outside set hours. Check the charger app to see if a schedule is active that is blocking charging right now.

Problem 2: Charging Stops Mid-Session

The charger starts charging but stops before the battery is full.

Common causes

Load management kicking in — if your charger has load management (and it should — see my guide on home electrics and EV chargers), it may reduce the charge rate or pause charging when household demand is high. This is normal and by design — the charger is preventing your main fuse from blowing. Charging will resume when demand drops.

The car’s battery management system — EVs slow their charge rate as the battery approaches full charge to protect battery health. This is normal behaviour. Some cars also stop charging at a set percentage (for example, 80 percent) if the owner has configured a charge limit.

Overheating — in very hot weather (or if the charger is in direct sunlight), the charger may reduce its output or pause to prevent overheating. Most quality chargers have thermal management that handles this automatically. If it happens frequently, the charger location may need reconsidering.

Wi-Fi or app issues — some smart chargers stop charging if they lose their internet connection, particularly if the charger is cloud-dependent for scheduling and authorisation. A poor Wi-Fi signal at the charger location is a common cause. Consider a Wi-Fi extender or mesh network if this happens regularly.

Problem 3: Slow Charging

The charger is working, but the charge rate is lower than expected.

Why this happens

Load management — as above, the charger may be reducing its output because other household loads are using the available supply. This is most noticeable during the evening when cooking, heating, and other appliances are running. Overnight (when household demand is minimal), the charger should run at full speed.

Cold weather — EV batteries charge more slowly in cold temperatures. This is a car issue, not a charger issue. The car’s battery management system reduces the charge rate to protect the battery when it is cold. Preconditioning the battery (using the car’s app to warm the battery before charging) can help.

The car’s onboard charger limit — the charging speed is limited by the car’s onboard AC charger OR the wall charger, whichever is lower. If your wall charger is 7kW but your car’s onboard charger is rated at 3.6kW, you will only get 3.6kW. Check your car’s specification.

Voltage drop — if the cable run from the consumer unit to the charger is very long, voltage drop can reduce the available power at the charger. This should have been accounted for during installation (using appropriately sized cable), but if the installation was not done correctly, it could be a factor.

Problem 4: Error Codes and Fault Lights

Most chargers display status using coloured LED lights or, on more advanced models, a small screen. When something goes wrong, the charger shows an error code or changes its light pattern.

What to do

Check the charger manufacturer’s manual or app for the meaning of the specific error code. Common errors include earth fault detected (the charger has detected a current leakage to earth — this is a safety feature), communication error (the charger cannot communicate with the car — often a cable connection issue), overcurrent protection (the charger has detected an excessive current draw), and firmware update required (the charger needs a software update, usually delivered automatically over Wi-Fi).

For persistent error codes that do not clear after a reset (turning the charger off at the consumer unit for 30 seconds, then back on), contact the charger manufacturer’s support line or your installer.

Problem 5: Water Ingress

EV chargers installed outdoors are designed to handle rain, but poor installation or seal degradation over time can allow water to enter the unit.

Signs of water ingress

Condensation visible inside the charger casing, corrosion on the cable connector or contacts, RCD tripping during or after rain, and a musty smell near the charger. If you suspect water ingress, stop using the charger and call an electrician. Water and 32A electrical circuits are a dangerous combination.

Prevention

A properly installed charger with the correct IP rating (IP65 or above for outdoor use) should handle any South Yorkshire weather. Ensure the cable entry points are properly sealed, the charger casing is intact (no cracks from impact or UV degradation), and the mounting is secure and the charger is not tilted in a way that allows water to pool.

Problem 6: Cable and Connector Wear

The charging cable and connectors are the components most subject to wear, particularly on tethered chargers where the cable is handled daily.

What to look for

Cracks, cuts, or abrasion on the cable outer sheath (particularly where it bends near the charger or where it contacts the ground), damaged or bent pins on the connector, a connector that does not click securely into the car’s charge port, and discolouration or heat damage on the connector (indicating a poor connection or overheating).

What to do

Minor cable damage (surface scuffing that has not penetrated the outer sheath) can be monitored. Any damage that exposes the inner insulation or conductors requires immediate professional attention — stop using the charger and call an electrician. Connector damage usually requires a cable replacement, which the charger manufacturer or an electrician can arrange.

Routine Maintenance Checklist

EV chargers do not need scheduled servicing, but a quick visual inspection every few months will catch problems early.

Monthly — glance at the charger when you plug in. Is the status light showing normally? Is the cable in good condition? Is the charger casing intact? This takes 10 seconds and costs nothing.

Every 6 months — wipe the charger casing with a damp cloth to remove dirt and grime (do not use a pressure washer). Check the cable for damage along its full length. Check the connector pins for corrosion or damage. Ensure the charger is still firmly mounted to the wall. Check that the charger app is up to date and connected to Wi-Fi.

Annually — test the RCD at the consumer unit using the test button (press it — the RCD should trip immediately, then reset it). If the charger has been in use for several years, consider having an electrician inspect the charger circuit as part of a periodic electrical inspection (EICR).

When to Call an Electrician

Some problems are DIY-fixable (resetting a tripped MCB, checking the charger schedule, reconnecting Wi-Fi). Others need a qualified electrician.

Call an electrician if the RCD or MCB trips repeatedly, there are signs of overheating (discoloured connectors, burning smell, heat damage), you see sparking when connecting the cable, the charger displays persistent error codes that do not clear after a reset, there is visible water ingress, the cable has physical damage exposing the inner conductors, or the charger has been physically damaged (for example, hit by a vehicle).

Do not attempt to open the charger casing or work on the wiring yourself. EV charger circuits run at 32A — a fault at this current level can cause serious injury or fire. Always isolate the charger at the consumer unit before an electrician works on it.

Charger Lifespan and Replacement

A quality EV charger, properly installed and reasonably maintained, should last 10 to 15 years or more. The electronics are solid-state (no moving parts to wear out), and the main failure points are the cable (replaceable), the connectors (replaceable), and the internal electronics (which can occasionally fail but are generally very reliable).

Most charger warranties are 3 to 5 years, though some premium models offer longer coverage. If your charger develops a fault outside the warranty period, repair is sometimes possible (depending on the fault and the availability of parts), but replacement may be more cost-effective, especially given the rapid improvement in charger technology.

Frequently Asked Questions

Do EV chargers need servicing?

No scheduled servicing is required. A visual inspection every few months and an annual RCD test are all that is needed for routine maintenance. The charger circuit should be included in any periodic electrical inspection (EICR) of the property.

Why does my EV charger keep tripping the RCD?

Occasional RCD trips can be caused by moisture, transient faults, or DC fault currents. Frequent trips indicate a genuine fault — either in the charger, the cable, or the circuit wiring. Stop using the charger and call an electrician if it trips more than once in a short period.

How long does a home EV charger last?

A quality charger, properly installed, should last 10 to 15 years or more. The cable and connectors may need replacing before the main unit, depending on usage and wear. Most manufacturer warranties are 3 to 5 years.

Can I repair my EV charger myself?

You can perform basic troubleshooting (resetting the MCB, checking Wi-Fi, reconnecting the cable). Do not open the charger casing or work on the wiring — EV charger circuits operate at 32A and any fault can cause serious injury or fire. Always call a qualified electrician for electrical faults.

My charger is charging slowly — is it broken?

Not necessarily. Slow charging is commonly caused by load management reducing the charge rate during peak household demand, cold weather reducing the battery’s acceptance rate, or the car’s onboard charger limiting the speed. Check the charger app for the actual charge rate and any load management activity.

If you have a problem with your EV charger, or you need an annual inspection of your charger circuit, call me on 07817 171954 or get in touch here. I am Mat from MP Electrical, a NAPIT-registered electrician covering Rotherham and South Yorkshire. I install, maintain, and troubleshoot EV chargers — whatever the issue, I can help.