Fault diagnosis & repair — South Wales

Solar PV Fault Finding & Repairs

Is your solar system not generating, showing error codes, or underperforming? Our engineers diagnose and fix faults across all makes and models of solar PV systems — inverters, panels, wiring, monitoring and more.

Gas Safe registered engineers. £110 inc VAT call-out charge. Same-week visits available across South Wales.

WhatsApp Us Book a Visit Online

£110

Call-out charge inc VAT

£55/hr

Additional labour (after first hour)

Same week

Visits available across South Wales

All makes

SolarEdge, SMA, Fronius, Fox ESS & more

Common solar PV faults

Is your system showing any of these symptoms?

Solar PV faults are often intermittent and go unnoticed for weeks. Any of the issues below is worth investigating — lost generation means lost savings.

No generation at all

Inverter not starting, system offline, or reading zero output. Could be inverter failure, DC isolation fault, or blown fuse.

Low or reduced output

System generating less than expected. Possible causes: shading issues, soiling, panel degradation, string imbalance, or MPPT faults.

Inverter error codes

Fault codes on the inverter display or app. We diagnose and interpret manufacturer codes across all major brands.

Monitoring offline

App showing no data or last reading was days ago. Monitoring faults hide generation problems — we restore connectivity and data logging.

Panel damage

Cracked cells, delamination, hotspots, or physical damage from storm or impact. We inspect, test and replace individual panels as needed.

DC isolator or wiring faults

DC isolators degrade over time and are a common failure point. Wiring faults, loose MC4 connectors, and earthing issues also cause intermittent problems.

Our repair process

What happens on a solar PV repair visit

Initial call

Tell us what you're seeing. We will ask about your system, the fault symptoms, and any error codes — helping us arrive prepared.

Site visit & diagnosis

We carry out a full electrical test of your system — panels, strings, inverter, isolators, wiring, and monitoring. The call-out charge covers the diagnostic visit.

Report & quote

We explain exactly what we found and provide a fixed-price quote for any repair work. No obligation to proceed.

Repair & test

If you approve the work, we carry out the repair on the same visit where possible, then retest the full system to confirm it is generating correctly.

Pricing

Transparent, fixed call-out charges

£110

Call-out charge

Includes VAT. Covers the diagnostic visit and written fault report. Payable regardless of outcome.

£55/hr

Additional labour

Charged per hour after the first diagnostic hour. Parts quoted separately. All pricing agreed before work begins.

Parts and replacement components are quoted separately and agreed before we proceed. No hidden charges.

Book a solar PV repair visit

WhatsApp us a photo of your inverter display or error code and we will advise before booking.

WhatsApp Us Call Technical: 07725 039396 Book Online

FAQs

Solar PV repair questions

Will I be charged if you cannot fix the fault?▾

The £110 call-out charge is payable regardless of outcome — it covers the engineer's time and the written diagnostic report. Any further repair work is quoted separately and only carried out with your approval.

Do you repair systems installed by other companies?▾

Yes — we repair solar PV systems installed by any company. We ask that you have as much paperwork as possible available (MCS certificate, installation date, inverter model) to help us prepare for the visit.

Which inverter brands do you work on?▾

We work on all major brands including SolarEdge, SMA, Fronius, Sungrow, Fox ESS, Sigenergy, GivEnergy, Enphase, and most others. If in doubt, contact us with the inverter model number.

My inverter is under warranty — can you still help?▾

If your inverter is under manufacturer warranty, contact the manufacturer directly first — a warranty claim is usually free. We can assist if you need an independent diagnosis or if the warranty claim process requires an engineer's report.

How quickly can you visit?▾

We aim to offer same-week visits across South Wales for most repair enquiries. Contact us via WhatsApp or phone for current availability.

Also available

Where we repair

Serving all of South Wales

Swansea Neath & Port Talbot Bridgend Cardiff Vale of Glamorgan Carmarthen Llanelli Pontypridd Merthyr Tydfil Pembrokeshire