What homeowners usually notice
- The charger's lights are off, or it shows a red, blinking or fault indicator
- The car connects but says it is not charging, or charges very slowly
- The breaker for the charger trips, sometimes on hot afternoons
- The plug, outlet or cord feels hot or looks discolored
What to do right now
- Unplug the connector from the car and look for a status or fault light on the charger
- Check the charger's breaker in the panel and reset it once if it is tripped
- Check the car's charging settings: scheduled charging, departure times and charge limit
- Stop using the charger if the plug or outlet is hot, melted or smells burnt
Likely causes
Tripped breaker or GFCI
A 240 V charging circuit can trip from a ground fault, moisture in the connector or an overloaded circuit. Some chargers also have their own internal ground-fault protection that shuts them down.
Vehicle-side settings
A charging schedule set for off-peak hours, a low charge limit or a software update can make it look like the charger failed when the car simply is not requesting power.
Charger fault
Chargers monitor temperature, grounding and voltage and will stop with a fault code if something looks wrong. The owner's manual explains what each light pattern means.
Loose or worn connection
A plug-in charger on a worn receptacle, or a loose termination, creates heat. Heat damage is a common reason for a charger that stops mid-session.
Undersized or shared circuit
A charger added to a circuit that also runs other loads, or wired smaller than the charger's setting, may trip or be throttled.
Safe checks you can make
- Write down the exact light pattern or error shown on the charger and on the car's screen
- Try the car's mobile charging cord on a standard outlet, if you have one, to see whether the car accepts a charge
- Look at the plug, receptacle and cord for melting, browning or cracked insulation without taking anything apart
Leave outlet covers, switch plates and the panel cover in place. Noting what you see and hear is enough; testing inside boxes belongs to an electrician.
Is this something you can fix yourself?
Many no-charge situations are fixed without anyone opening a box. Resetting a tripped breaker once, fixing a charging schedule or charge limit in the car, reseating the connector, and power-cycling the charger through its breaker are all reasonable. If the charger shows an internal fault code, its maker's support line may be the right next step, and a vehicle that will not charge anywhere needs the dealer or a vehicle service shop. A licensed electrician is the right call when the circuit trips repeatedly, the receptacle or plug shows heat, or the charger has no power even though the breaker is on.
When professional help is the right call
- The breaker trips again after one reset
- Scorching, melting or a hot smell at the plug, receptacle or charger
- The charger was installed on an existing circuit shared with other loads
- Charging works on another outlet or charger but never on this one
- Water got into the charger, connector holster or outdoor enclosure
Safety first. Stop charging and turn off the breaker, if you can reach it safely from outside the panel, if the plug or outlet is hot, melted or crackling. Smoke or flame from the charger, cord or garage wiring means get out and call 911. Do not use extension cords or adapters to get around the problem.
What an electrician typically checks
An electrician will check that the circuit size matches the charger's setting, test voltage at the charger under load, inspect the receptacle or hardwired connections for heat, and confirm grounding. They can replace a worn receptacle with a heavy-duty one, tighten or redo terminations, and correct a breaker that does not match the wiring.
If your panel is short on capacity, they may discuss load management or an upgrade. The pages on EV charger installation and the EV charger installation guide explain circuit sizing, and garage electrical work covers the space where most home chargers live.
Keeping it from coming back
Keep the connector holstered and out of standing water, check the plug and receptacle for warmth now and then during a long session, and do not share the charging circuit with other equipment. In a hot Birmingham garage, good airflow helps the charger avoid heat faults. Have new or relocated chargers installed on a dedicated circuit with the right permit, and check with your city or county on permit details.