EV Charger Diagnostics — Find the Fault Fast
Not sure why your EV charger stopped working? Our certified technicians arrive on site with professional diagnostic equipment, identify the exact fault, and provide a written report — before any repair work begins.
Is Your EV Charger Showing These Symptoms?
Any of these symptoms indicate a fault that needs professional diagnosis. Ignoring them can lead to bigger damage — or create a safety risk.
Won't Start Charging
You plug in the cable but charging never starts. Could be a control board, relay, or CP signal fault.
Error Code / Fault Light
Red light, blinking pattern or error code on display. Each code points to a specific component failure.
Slow Charging
Charger rated at 11 or 22 kW but only delivering 2–3 kW. Current sensor, cable or load setting issue.
Session Keeps Dropping
Charging starts but disconnects after a few minutes. Contactor fault, overheating protection, or connectivity issue.
Overheating
Charger body becomes very hot or thermal shutdown activates. Safety-critical — must not be ignored.
App / RFID Not Working
Cannot control charger via app or RFID card. Communication module, Wi-Fi or firmware fault.
How We Diagnose Your EV Charger
Our structured 5-step process ensures no fault is missed — from the initial interview to the final written report.
Initial Interview
We gather all relevant information — when the fault appeared, what the charger does (or doesn't do), any recent changes to the electrical installation.
Electrical Measurements
Voltage, current, insulation resistance, grounding and RCD function — full electrical safety check with calibrated instruments.
Error Code Reading
We connect to the charger's diagnostic interface and read all stored fault codes — including intermittent faults that aren't currently active.
CP Signal & Communication Test
Control Pilot signal analysis to identify handshake failures between charger and vehicle. App and OCPP connectivity test.
Written Report & Quote
You receive a complete written diagnostic report with identified faults, recommended actions, and a transparent repair cost estimate.
If your charger sparks, smells of burning, or trips your main circuit breaker — stop using it immediately and book emergency diagnostics. Do not attempt to open or inspect the unit yourself.
EV Charger Error Codes — What They Mean
These are the most common fault codes we encounter. Don't try to reset and ignore — codes indicate real faults that need diagnosis.
| Code / Symptom | Likely Cause | Severity |
|---|---|---|
| E01 / No CP signal | Control Pilot circuit failure — contactor or wiring fault | Critical |
| E03 / Ground fault | Grounding failure — potential shock risk, must be fixed immediately | Critical |
| E05 / Overcurrent | Current higher than rated — cable, fuse or load balancing issue | Warning |
| E07 / Over-temperature | Thermal protection triggered — ventilation or cooling fault | Warning |
| E09 / Communication lost | Wi-Fi, 4G or OCPP connection dropped — module or firmware issue | Info |
| Blinking red light | Generic fault — requires diagnostic equipment to identify root cause | Warning |
What Our Clients Say
Easee charger was showing a fault light for two weeks. The technician diagnosed a firmware issue within 30 minutes and fixed it on the spot. Excellent service.
Wallbox kept disconnecting mid-charge. They found a faulty contactor, showed me the test results, quoted the repair on the spot. Very transparent process.
The written diagnostic report was very detailed. I could see exactly what was wrong and what the repair would involve before committing to anything. Very professional.
Frequently Asked Questions
Get a Free Quote
Fill in the form — a specialist will contact you within 5 minutes and help you choose the right solution.
- ✓ Free consultation and quote
- ✓ Installation for homes, apartments and businesses
- ✓ 7.4 kW, 11 kW and 22 kW wallbox units
- ✓ Full electrical installation and documentation
- ✓ 6-month warranty on all work
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