You Plugged In, but the Battery Didn’t Fill
You plug in the car when you get home, and the next morning the battery sits right where you left it. Or the charger starts fine, then clicks off an hour later with the breaker tripped in the basement. An EV charger not working is frustrating, especially when you rely on it for the morning commute.
Many charging problems have simple causes you can check yourself in a few minutes. This guide goes through those checks first, then covers the signs that point to the circuit, the receptacle or the panel.
Start With the Status Lights and the App
Most Level 2 chargers use colored lights or a small display to report what’s wrong. A solid green or blue light usually means ready, a pulsing light means charging, and red or amber usually means a fault. The meaning varies by brand, so keep the quick start guide handy or find it on the maker’s website.
If you have a smart charger, open its app. It often names the exact fault, such as a ground fault, overheating or a lost connection to the car.
Homeowner Checks to Try First
Work through these in order:
- Check the car’s charge schedule. Many drivers set charging to start during overnight off-peak hours and then forget. The car or app may be waiting on purpose.
- Check the charge limit. If the car is set to stop at a certain percentage, it may simply be full.
- Reseat the connector. Unplug from the car, look for dirt, ice or bent pins, then plug back in firmly until it clicks.
- Check the breaker. Look for a tripped breaker in the panel. A tripped breaker sits in the middle position.
- Restart the charger. Turn off its breaker, wait a minute, turn it back on and let it finish starting up.
- Check Wi-Fi. Smart chargers may refuse to start if they need an app authorization and have lost the network.
- Try the included cord. If your car charges on its portable Level 1 cord, the car is probably fine and the problem is on the charger or circuit side.
If one of these gets you charging again and the problem doesn’t come back, you’re likely all set.
Why a Home EV Charger Keeps Tripping the Breaker
A home EV charger tripping the breaker is one of the most common charging complaints. A breaker trips to protect the wiring, so repeated trips always have a reason.
- The charger is set too high for the circuit. Code treats EV charging as a continuous load, so a charger can use only 80 percent of the breaker’s rating. A 48 amp charger on a 50 amp breaker will trip. Many chargers have an internal setting that must match the circuit.
- The circuit is shared. A charger should have its own dedicated circuit. Sharing with a freezer, compressor or garage outlets leads to trips.
- A connection is loose or overheating. Loose terminals at the breaker, charger or receptacle heat up under the long hours of EV charging.
- The receptacle is worn. Plug-in chargers on a 240 volt outlet put that outlet under heavy load for hours. Lower-grade receptacles can loosen and overheat over time.
- A ground fault. Moisture in an outdoor charger or damaged cable can trip the charger’s own protection or a GFCI breaker.
Please don’t swap in a larger breaker to stop the tripping. The breaker is sized for the wire, and a bigger one would let that wire overheat.
Level 2 Charger Troubleshooting by Symptom
A few common patterns and what they usually mean:
- Charger has no lights at all. No power is reaching it. Check the breaker first, then call us if it’s on and the charger is still dark.
- Charging starts, then stops. Often a scheduling setting, an overheating protection shutdown or a loose connection.
- Charging is much slower than usual. Check the charger’s current setting and the car’s charge settings. Cold batteries charge slowly at first.
- Fault light after rain or snowmelt. Water may be reaching the connector or an outdoor receptacle.
- Car says “charging” but range barely moves. The charger may be limited to a low amp setting, or it may be running as a slower Level 1 unit.
Signs You Need an Electrician Right Away
Stop charging and turn off the breaker if you notice:
- A hot, burning or melting plastic smell near the charger or outlet
- Discoloration or scorch marks on the receptacle or plug
- A charger, plug or wall plate that feels hot to the touch
- Buzzing or crackling from the charger, outlet or panel
- A breaker that trips again as soon as you reset it
These point to a connection that’s overheating, and they’re worth having checked before the car is plugged in again.
Habits That Prevent Charger Problems
A few small habits keep a home charger working for years:
- Hang the cable. Use the holster and cable hook so the cord isn’t run over, kinked or left in slush on the garage floor.
- Keep the connector clean and dry. Knock off snow and ice before plugging in, and store the handle in its holster so water and dirt stay out.
- Install updates. Smart chargers get firmware updates that fix bugs and improve how they talk to your car.
- Look at the outlet now and then. On plug-in chargers, check the plug and receptacle for discoloration or a loose fit a few times a year.
- Watch for new behavior. A charger that suddenly charges slower, trips or shows faults is telling you something changed.
How We Diagnose and Fix Charger Problems
When we come out, we test the circuit under load, check the tightness and condition of every connection from the panel to the charger, and confirm the charger’s settings match the breaker and wire size. We also look at the panel’s overall load to make sure the charger isn’t pushing your service past its limit.
Common fixes include replacing a worn receptacle with an industrial grade one, hardwiring a plug-in charger, correcting the charger’s amp setting, moving the charger to its own circuit, or planning a 200 amp service upgrade when the home is simply out of capacity.
EV Charger Help in Ann Arbor
Current Electrical Systems installs and repairs Level 2 chargers of every brand, including the Tesla Wall Connector. We’ve served Ann Arbor, Canton, Plymouth, Brighton and the surrounding area since 1994 with union electricians from IBEW Local 252. Learn more about our EV charger services, or compare charging options in our guide to Level 1 vs. Level 2 charging. Estimates are always free.