How to Troubleshoot Common Home EV Charger Issues

EV charger troubleshooting has gotten complicated with all the smart features, connectivity options, and compatibility variables flying around. As someone who’s diagnosed dozens of charger problems for friends and neighbors in the Northwest, I learned everything there is to know about what actually goes wrong and how to fix it. Today, I will share it all with you.

Most charger issues have simple solutions. Here’s what to check before calling for help.

Charger Won’t Power On

Probably should have led with this section, honestly—no power is the most common complaint. Start with the basics:

• Check the circuit breaker. EV chargers trip breakers sometimes, especially in older panels. Reset if needed.
• Test the outlet with another device to confirm power.
• Inspect the power cord for visible damage.
• Check the charger’s internal breaker or fuse if equipped.

Connection Failures

That’s what makes connection issues endearing to us troubleshooters—usually dirt or alignment:

• Clean the connector and your vehicle’s charge port. Dust, leaves, even spider webs accumulate.
• Check for bent pins or visible damage on either end.
• Ensure solid connection—some vehicles require firm seating.
• Try unplugging and reconnecting. Simple but often effective.

Slow Charging

Slower than expected charging has several possible causes:

• Check charger settings. Many units have adjustable amperage—verify you’re not on a reduced setting.
• Extension cords kill charging speed. Avoid them entirely for Level 2.
• Home electrical issues affect charging. If lights dim when charging starts, your electrical system needs evaluation.
• Battery temperature affects acceptance rate. Cold batteries charge slower.

Charger Overheating

Overheating triggers safety shutoffs. Address root causes:

• Ensure adequate ventilation around the charger. Don’t box it in.
• Avoid direct sun exposure for extended periods.
• Check for other high-draw devices on the same circuit.
• Consider a dedicated circuit if sharing causes problems.

Intermittent Charging

Charging that stops and starts randomly indicates:

• Loose connections in the cable or at the vehicle.
• Damaged cable with internal breaks.
• Software bugs—check for charger and vehicle firmware updates.
• Thermal management—some vehicles pause charging to condition the battery.

Display Problems

When the screen won’t show status:

• Power cycle the charger—turn off at breaker, wait 30 seconds, restore power.
• Check for firmware updates.
• Screen damage requires professional repair.

App/Connectivity Issues

Smart charger apps failing to connect:

• Verify WiFi connection to charger.
• Check that charger and phone are on the same network if required.
• Update the app to latest version.
• Restart both the charger and your phone.
• Re-register the charger in the app if persistent.

Charging Stuck at Percentage

Charging stopping at specific percentages usually means:

• Battery management systems limiting charge for longevity (common to stop at 80%).
• Check vehicle charge limit settings.
• Battery conditioning cycles in progress—wait and see if it resumes.

When to Call a Pro

Some issues require professional help:

• Burning smells or visible damage.
• Repeated breaker trips after reset.
• Water intrusion in outdoor units.
• Persistent problems after basic troubleshooting.

Keep your charger’s manual handy—it contains model-specific guidance. Most issues resolve with simple fixes, but don’t hesitate to call your electrician when something seems wrong.