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EV Charger Fault Diagnosis

We diagnose EV chargers that keep tripping, stop charging after a period of use, or behave intermittently across Stafford and surrounding areas.

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When an EV Charger Keeps Tripping, Guesswork Isn’t Enough

EV charging issues are often passed between installer, manufacturer and vehicle dealer — especially when the fault is intermittent. We provide structured EV charger fault diagnosis under real charging conditions, so you get a clear technical answer on whether the problem lies with the installation, the charger, or the vehicle.

Domestic EV charger installed on an external wall

Common EV Charging Problems We Investigate

Repeated RCBO/RCD tripping, charging that stops after 10–20 minutes, chargers that refuse to start, intermittent faults, or situations where public charging works but home charging doesn’t. Our goal is to isolate the cause with measurable evidence and a repeatable diagnostic process.

Functional Testing + Real Load Behaviour

We don’t just check basic electrical readings and leave. We carry out EVSE functional testing using a specialist EV test adapter, then observe the system under sustained charging conditions. This helps reveal faults that only appear under real load — including nuisance trips caused by residual current and thermal drift.

EV charger being tested using specialist EVSE test equipment
EV electrical test kit including clamp meter and accessories

Residual Current (Earth Leakage) Measurement Under Load

Many nuisance trips happen because residual current rises during charging and approaches the 30mA trip threshold over time. We use a high-sensitivity earth leakage clamp to measure leakage behaviour during charging, allowing us to identify borderline conditions and provide a clear technical explanation of what’s happening.

What We Do During a Diagnostic Visit

  • Verification of supply characteristics, earthing arrangement and protective device suitability
  • Assessment of overall installation integrity and safety performance
  • Functional EV chargepoint testing to confirm correct operational behaviour
  • Structured observation under sustained charging conditions to replicate real-world use
  • Analysis of residual current behaviour during charging to identify nuisance-trip patterns
  • Evaluation of voltage stability and system performance under load
  • Isolation of installation, charger or vehicle contribution where required
  • Clear documentation of findings with technical conclusions and recommended next steps

What You Gain — And What to Consider

Advantages

  • Clear, structured diagnosis — not guesswork or assumptions
  • We test under real charging conditions, not just “cold” electrical values
  • Identifies whether the issue is installation, charger, or vehicle-related
  • You receive a written diagnostic summary with findings and next steps

Disadvantages

  • Some intermittent faults require a sustained test period (typically 20–30 minutes)
  • Where possible, we may request a second vehicle comparison test to isolate vehicle contribution
  • This service is a diagnostic assessment — any repairs or remedial works are quoted separately

What This Service Helps Identify

  • EV charger fault diagnosis specialists in Stafford and surrounding areas
  • Structured testing process designed to identify the real cause, not assumptions
  • Live load & leakage analysis to capture faults that only appear after 10–30 minutes
  • EVSE functional testing with specialist equipment (not just a visual check)
  • Clear written diagnostic summary with findings and recommendations
  • Independent verification useful when issues are being passed between installer and vehicle
  • Option to proceed with remedial works once the cause is confirmed

You Receive a Written Diagnostic Summary

You’ll receive a structured diagnostic summary documenting the key tests carried out, observed behaviour under load, and our technical findings with recommended next steps. This is not an EIC/EICR — it’s a documented fault assessment designed to provide clarity and direction.

Independent Verification (Including Trade Support)

Where charging issues are being disputed between installer and vehicle, an independent diagnostic report can provide clarity. We can also support local garages and vehicle specialists by providing third-party EV charging fault verification when required.

Book an EV Charger Diagnostic Visit

If your charger keeps tripping, stops after a period of charging, or you need a clear technical answer on whether the issue is installation, charger or vehicle-related — book a diagnostic visit and we’ll run structured testing under real load conditions.

Book diagnostic visit