Very very helpfuland so quick. Made sure that a non expert like myself understood what the problem was and how to resolve it.
Solis Fault Code Index
- Sourced from Solis commissioning guides
- Covers single-phase and three-phase models
- SolisCloud + inverter display codes
If your Solis inverter is showing a fault code and you need expert diagnosis, a remote diagnostic identifies the cause and recommends the fix — usually within 30 minutes.
Book Solis diagnosis — freeHow diagnostics workRon is incredibly knowledgeable about solar installs in general but knows givenergy products inside out and the key personnel that worked there from the start to the end. My problem was spurious in its nature but Ron spotted it straight away when he understood the installation details. In essence the installers didn’t fit the correct trip switch. He also gave me hope that in the future hardware repairs could be possible but it’s still early days. This guy really is in the know and keen to sucas a business If you need help don’t hesitate
STS were incredibly responsive and helpful In diagnosing an issue with my GivEnergy inverter. Although distance meant it was impractical for me to use them to fully solve the issue, I’m grateful for the help and detail they provided. Don is a real professional gent and a hero in my eyes.
Thank you for your diligence. On this occasion the battery was able to be saved but they have given a route to hopefully arrange a repair from the manufacturer.
Massively massively recommended. We had a big battery array (49kW across three phases) put in four years ago. c £35k cost. It’s been a total nightmare for many reasons, not least 1. our installer being totally useless and unresponsive and 2. Givenergy, our battery supplier, going bust. Long story short it had never worked anywhere near properly despite countless hours on phones and emails; the best we’d achieved was one third of the batteries working. Rather than write it off, I asked a PM friend to try to source someone who could come on site and review and revive the system. He found Solar Tech Support and Ron. Ron assured us he was the man to get it going again. After so many years of pain, I was not convinced but, true to his word, five hours later it was up and running. Lovely chap, super knowledgeable with a support team to lean on who are also clearly super technical. I honestly didn’t think there was much chance of getting this array going ever again so was absolutely delighted when Ron and team pulled it off. Bravo!
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.
Fault codes generated by the Solis inverter in response to DC voltage issues, temperature, and hardware failures.
F01 / DC over voltagePV voltage too highF02 / DC insulation fault Insulation faultF04 / Over temperatureTemperature too highF05 / Relay faultRelay not operatingF07 / AFCI arc fault Arc faultINI-FAULT / Initialisation faultStartup self-test failedGrid voltage and frequency events that cause the inverter to disconnect as a safety protection.
F12 / Grid over voltageOvervoltage disconnectF13 / Grid under voltageUndervoltage disconnectF14 / Grid over frequencyOver-frequency disconnectF15 / Grid under frequencyUnder-frequency disconnectF16 / Grid lostNo grid supplyG-IMP / Grid impedance highGrid impedance too highFault codes related to insulation resistance on the DC and AC sides of the inverter.
F03 / AC isolation fault AC insulationFault codes from the battery management system — communication failures and voltage protection events.
F21 / BMS communication failBMS not respondingF22 / Battery over voltageVoltage too highF23 / Battery under voltageVoltage too lowF24 / Battery over currentCurrent exceeded limitFaults related to data communication between inverter and monitoring portal, and with system components.
Meter comms failMeter offlineSolisCloud offlinePortal not receiving dataDRM faultDemand response modeSolis releases firmware updates that may introduce new fault codes. If your code isn't listed, share the exact code from your inverter display or SolisCloud and we'll identify it.
Identifying fault source in PV string cabling, connectors, and panel junction boxes.
RS485 cable checks, power cycle, firmware compatibility, and hardware fault diagnosis.
Overvoltage causes, DNO notification process, and export limit configuration.
Solis fault code questions
Got a fault code and need it diagnosed?
Share the exact fault code from your inverter display or SolisCloud, what the system is doing, and when it started. We'll identify the cause and tell you whether it needs a remote settings fix or a site visit.
- Not affiliated with Solis
- No fix, no fee
- Written report with cause and recommended action
We use cookies to measure traffic and improve our ads — including sharing limited, hashed details with Meta (Facebook) to measure ad performance. Accept, or decline for essential cookies only. Privacy policy
Got a solar fault or need a quick answer? Drop us a message — we usually reply within a few minutes. Mon–Fri, 9am–7pm.