State code error, isolation fault, Solar.web offline — we diagnose Fronius systems remotely in a single session.
Book your free remote diagnosticSee the Solar Health PlanSafety: do not open inverter enclosures. If the inverter displays an isolation fault, do not repeatedly restart — this does not fix the fault.
Brilliant support to get my solar battery working again. I didn’t expect help on a Saturday but Ron answered the phone, listened and sent me the information I needed to get it going, answered questions etc. A brilliant service I’d happily recommend.
Ron was brilliant. He really tried to help. He spent hours trying to fix our GivEnergy AIO and ultimately it became apparent that it needed parts to fix the BMS management system. As there appears to be no replacement parts available on the market, he gave excellent advice on what options are now available to move forward. He is incredibly helpful and knowledgeable.
Called back within a day and gave good advice.
Ron was extremely helpful and tried his best to repair/reset our GivEnergy inverter remotely. In the event he was unsuccessful but he couldn’t have been more helpful. If you have problems with a GivEnergy system please contact him. Highly recommended
Big thanks to Ron. He was incredibly patient and helpful over the phone, taking the time to walk myself and the installer through every troubleshooting step. Through lots of testing he figured out the issue was definitely a hardware issue, which allows us to consider our next steps. Support fees are clear and they operate a “no fix no fee” policy. It is rare to find that kind of honesty combined with dedicated phone support nowadays. I highly recommend Ron, if you need help with your solar system don’t hesitate to give him a call.
A superb service from Ron who went beyond the normal service received from other Tech support companies. I live abroad and was badly let down when my givenergy system failed (and the company went bankrupt) and the local supplier ran away from the problem. Ron sorted the problem and even accessed specialist coding for the inverter that would not be available for suppliers. Ron also ran a full diagnostic to insure that all was in good working order afterwards. Without Rons support and patient assistance I doubt I would ever have got the system back up and running. Well done and thankyou and you have a customer for the future.
Brilliant support to get my solar battery working again. I didn’t expect help on a Saturday but Ron answered the phone, listened and sent me the information I needed to get it going, answered questions etc. A brilliant service I’d happily recommend.
Ron was brilliant. He really tried to help. He spent hours trying to fix our GivEnergy AIO and ultimately it became apparent that it needed parts to fix the BMS management system. As there appears to be no replacement parts available on the market, he gave excellent advice on what options are now available to move forward. He is incredibly helpful and knowledgeable.
Called back within a day and gave good advice.
Ron was extremely helpful and tried his best to repair/reset our GivEnergy inverter remotely. In the event he was unsuccessful but he couldn’t have been more helpful. If you have problems with a GivEnergy system please contact him. Highly recommended
Big thanks to Ron. He was incredibly patient and helpful over the phone, taking the time to walk myself and the installer through every troubleshooting step. Through lots of testing he figured out the issue was definitely a hardware issue, which allows us to consider our next steps. Support fees are clear and they operate a “no fix no fee” policy. It is rare to find that kind of honesty combined with dedicated phone support nowadays. I highly recommend Ron, if you need help with your solar system don’t hesitate to give him a call.
A superb service from Ron who went beyond the normal service received from other Tech support companies. I live abroad and was badly let down when my givenergy system failed (and the company went bankrupt) and the local supplier ran away from the problem. Ron sorted the problem and even accessed specialist coding for the inverter that would not be available for suppliers. Ron also ran a full diagnostic to insure that all was in good working order afterwards. Without Rons support and patient assistance I doubt I would ever have got the system back up and running. Well done and thankyou and you have a customer for the future.
Every fault below has a proven diagnostic path. Click through for the specific page or book a diagnostic if you're unsure.
Fronius displays state codes on the LED display and in Solar.web event log. Format xxx.yyy indicates fault category and specific event. Common codes: 102.x (grid fault), 401.x (isolation fault), temperature events. Diagnosis requires checking the exact code and timestamp.
See diagnostic guide →Inverter powered but generating zero power. Could be a DC string fault, isolator not closed, or protection trip not cleared. Check Solar.web historical data and string-level metrics to identify the fault pattern.
See diagnostic guide →Inverter generating below expected output for conditions. May indicate soiled panels, partial string shading, or internal component degradation. Solar.web data analysis reveals the loss pattern over time.
See diagnostic guide →Inverter has measured a drop in DC-to-earth resistance below the safe threshold. Common causes: water ingress into MC4 connectors, cracked cable insulation from UV, or failed panel junction box. Do not repeatedly restart — this is a genuine safety fault requiring investigation.
See diagnostic guide →AC voltage or frequency at grid connection has exceeded safe limits. Common in solar-dense streets where export raises local grid voltage. May clear automatically or require export limit configuration and DNO notification.
See diagnostic guide →Age-related component failure common in Fronius units from 2012–2018. Causes intermittent shutdowns, output reduction, and eventually complete failure. Capacitor replacement is viable on well-maintained units under 10 years old.
See diagnostic guide →Portal shows no data while inverter is generating. Caused by Fronius Datamanager communication card losing internet connection. Router change, WiFi password update, or broadband failure. Inverter continues to operate normally.
See diagnostic guide →Fronius Datamanager card unable to find WiFi network. Requires reconfiguration via the Datamanager setup wizard (accessible at inverter IP address on local network) or Fronius Solar.web app Bluetooth setup.
See diagnostic guide →Seeing an error code in Solar.web or on the inverter display? Our full Fronius state code index explains what each code means, common causes, and safe next steps.
We review Solar.web data, inverter settings, and fault history to identify the exact fault without a site visit.
Installer gone bust, Solar.web access lost, or monitoring never set up correctly? We recover access and rebuild documentation.
Isolation fault investigation, DC cable fault location, capacitor replacement assessment, component repair. Targeted visit — no guesswork on arrival.
Download datasheets, installation manuals and warranty documents for Fronius Symo inverters and battery systems. Self-hosted and always current.
Fronius is one of the UK's most established solar inverter manufacturers. The Primo (1–15kW single-phase) and Symo (3–25kW three-phase) ranges have been installed since 2012, making them some of the oldest string inverters still in widespread use. The legacy SnapINverter series (Galvo) from 2012–2018 is also still supported.
Fronius inverters are string inverters — no optimizers, whole-string MPPT. State codes (xxx.yyy format) are the standard fault language — the first three digits identify the fault category (102 for AC grid, 401 for isolation), decimal digits for specific events. Isolation faults are most serious — they indicate DC-to-earth resistance drop and trigger automatic shutdown for safety.
The Solar.web portal and app are powered by the Fronius Datamanager communication card. Many units from 2012–2018 are now 8–12 years old and approaching capacitor end-of-life. Capacitor degradation is the most common age-related failure causing intermittent shutdowns and output reduction. If you're searching for Fronius repair UK, Fronius state code, Fronius isolation fault, Fronius Solar.web offline, or Fronius capacitor replacement, STS provides independent diagnostic and repair support across the UK — not affiliated with Fronius.
STS supports all major inverter and battery brands — not just Fronius. If you have a mixed-brand system or are comparing options, visit the brand hub.
Browse all 19 brandsTell us what's happening. We'll review your details and come back with a clear diagnosis path — usually same day.
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