Diagnostics and repair
EV Charger Repair and Troubleshooting in Sunnyvale
Diagnosing faults, tripping breakers and bad prior installs across Sunnyvale, Mountain View, Santa Clara and Cupertino.
Diagnose, then decide
Before You Replace the Charger, Test the Circuit
A charger that stops working is usually telling you something about the wiring behind it. EV charger repair and troubleshooting in Sunnyvale starts at the panel and works outward, because the majority of the faults we are called for turn out to be circuit problems wearing a charger's error code. Sunnyvale EV Charger Installation sees the same handful of causes repeatedly: an undersized conductor on a long run, a shared neutral left over from a remodel, a loose termination that has been slowly heating, a GFCI conflict created by plugging a unit with internal protection into a protected circuit, or a receptacle that was never rated for continuous duty. Replacing the hardware fixes none of those. We diagnose first, tell you plainly what failed, and quote the actual repair.
Circuit tested end to end under real load
Cause and repair price given before any work starts
Thermal inspection of every termination
Written findings you can take back to the original installer
What a Diagnostic Visit Covers
What a diagnostic visit covers and what we can repair on the spot.
Full circuit diagnosis from panel to unitWe test the breaker, the conductors, the terminations and the device, and we measure under load rather than reading a static voltage and guessing.
Nuisance trip root-cause analysisTripping has a cause, and it is usually thermal, a shared neutral, an undersized conductor or a GFCI conflict. We identify which one rather than swapping the breaker and hoping.
Ground fault and error code interpretationManufacturer fault codes point in a direction but rarely name the problem. We translate what the unit is reporting into what is physically happening on the circuit.
Thermal inspection of terminationsHeat at a lug or a receptacle contact is both a failure cause and a fire risk, and it is visible under load long before anything melts.
Receptacle replacement with a rated deviceWhere a builder-grade 14-50 has degraded, we replace it with an industrial-grade receptacle that can survive the duty cycle.
Correcting undersized or improperly run conductorsIf the original run cannot carry the load, we re-pull it correctly rather than dialing your charge rate down permanently.
Repairing unpermitted prior installsWe identify what does not comply, correct it, and bring the circuit onto a permit so it is legitimate going forward.
Charger replacement when the unit really has failedSometimes the hardware is genuinely dead, and when it is we say so and install the replacement properly.
Re-commissioning and network reconnectionSmart units get reconnected to the network and firmware-checked, since a unit that lost its network often looks broken when it is not.
Written findingsYou get a plain explanation of what was wrong, what we did, and what to watch for, which matters if you are going back to whoever did the original work.
How it works
Symptom, Diagnosis, Verified Repair
Step one
Describe the symptom
Tripping at plug-in, tripping hours in, slow charging, a specific fault code, or nothing at all. Each of those points at a different part of the circuit, and it often shortens the visit considerably.
Step two
On-site diagnosis
We test the circuit end to end under real load. Most faults are identified within the first hour, and you get the cause and the repair price before we proceed.
Step three
Repair and verify
We make the correction, then run the charger at full rated current and confirm it holds with no heat and no fault. If the repair required new circuit work, we permit and inspect it.
Why Choose Us for Charger Repair
We do not sell you a charger you do not need
Replacing the unit is the easy diagnosis and usually the wrong one. Testing the circuit first is slower and it is how you avoid buying identical hardware that fails the same way in a month.
We fix other people's work without drama
A lot of what we repair around Sunnyvale came from a handyman or a general electrician unfamiliar with continuous EV loads. We explain what went wrong factually so you can have an informed conversation with whoever installed it.
Repairs get permitted when the work warrants it
If the correction involves new circuit work, it goes on a permit and through inspection. That restores your insurance position and your eligibility for incentive programs.
Get Your Sunnyvale Charger Working Again
Tell us the symptom and we can usually narrow the likely cause on the phone. Then one visit gets the circuit tested end to end and the real repair quoted before any work starts.
(408) 317-9189