Your EV charger should be one of the most boring parts of your day — plug in at night, unplug a full battery in the morning. If it’s doing anything more interesting than that, it’s worth paying attention.
Most EV charger problems come from one of two places: the charger itself starting to fail, or the original installation not being sized correctly for the home. Either way, these issues rarely show up as a dramatic failure first. They show up as small, easy-to-dismiss signs. Here’s what to watch for.
Signs to Watch For
The charger or outlet feels warm to the touch.
A little warmth right at the connection point during active charging isn’t unusual. But if the charger body, the plug, or the wall connection feels noticeably hot — hotter than you’d want to hold your hand on — stop using it and have it looked at.
The charging cable is warm along its length, not just at the ends.
This usually means the cable is undersized for the amount of power running through it. It’s a wear-and-heat issue that gets worse over time, not better.
Charging has gotten noticeably slower.
If your car used to charge overnight and now takes noticeably longer, something’s changed — a loose connection, a failing charger component, or a circuit that isn’t delivering full power anymore.
The breaker trips when you plug in or during charging.
This is one of the clearest signs of a real problem. It usually means the circuit isn’t sized correctly for the charger’s draw, or there’s a fault somewhere in the charger or wiring. Don’t just keep resetting it.
The lights flicker or dim elsewhere in the house when charging starts.
This points to your electrical panel being close to its capacity. It’s especially common in older homes where an EV charger was added without checking whether the panel could actually support it.
There’s a burning smell near the charger, outlet, or panel.
Stop charging immediately. This is not a “monitor it” situation — it needs a same-day look.
The charger was plugged into a regular household outlet, not a dedicated circuit.
A Level 2 charger needs its own dedicated 240-volt circuit. If yours is sharing a circuit with anything else, that’s a setup issue, not a charger issue, and it’s worth having corrected before it causes bigger problems.
Visible cracking, fraying, or wear on the charging cable.
The cable lives outside, gets stepped on, coiled and uncoiled daily, and takes weather exposure. Damaged insulation exposes live wiring underneath.
The charger shows an error code and you’ve been ignoring it.
Error codes exist for a reason. Resetting the charger repeatedly without addressing what triggered the code just delays the actual problem.
It was installed without a permit or by someone who wasn’t a licensed electrician.
This one doesn’t always show symptoms right away — which is exactly what makes it risky. An unpermitted install means nobody verified the wire gauge, the grounding, or the panel capacity. Problems from unlicensed EV charger work are one of the most common issues we get called out for. Curious what else goes wrong with unlicensed work? We cover it in What Really Goes Wrong With DIY or Unlicensed EV Charger Installs.
What This Usually Means
Most of what’s on this list traces back to one of three root causes:
- The circuit wasn’t sized correctly for the charger — often from a DIY or unlicensed install that skipped the load calculation step.
- The home’s panel doesn’t have the capacity it needs, especially in older homes that added EV charging without a panel evaluation first.
- The charger itself is wearing out — after years of daily use, this is normal, and usually just means a charger replacement, not a full rewire.
When to Call
If you’re seeing heat, burning smells, sparking, or repeated breaker trips — call the same day. If it’s slower charging, minor flickering, or an error code, it’s worth scheduling a visit soon rather than waiting for it to get worse.
Swartz Green Electric is a Qmerit-certified partner and Tesla-certified installer serving Houston and the surrounding area. If any of this sounds familiar, contact us for a free evaluation.