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Fault code index · Solis inverter and battery

Solis Fault Code Index

Every Solis fault code from the inverter display and SolisCloud portal — what it means, the most likely cause, and what to do. Find your code in the index below or use the category sections to browse by system area.

Sourced from Solis commissioning guides Covers single-phase and three-phase models SolisCloud + inverter display codes

Solis Fault Code Index

Every Solis fault code from the inverter display and SolisCloud portal — what it means, the most likely cause, and what to do. Find your code in the index below or use the category sections to browse by system area.
  • Sourced from Solis commissioning guides
  • Covers single-phase and three-phase models
  • SolisCloud + inverter display codes
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5.0
13 Trustpilot reviews
Trustpilot Google

I have a GivEnergy system consisting of two batteries, two inverters and a controlling EMS (Energy Management System) which has not worked since Nov 2025. After six months I discovered Solar Tech Support, reached out to them and Ron phoned me back – how often do you get that service? Could not be more helpful – worked directly with me over the phone, outside what I would call normal working hours. Lucid explanations and we were able to discuss the issues and history using camera and email history. As this was a very rare setup, Ron was able to access an EMS expert in the field to confirm the solution. One sunny day in, I am now only paying for standing charge and a few pence for spikes in grid consumption while battery catches up with house demand.

Ian · May 2026 Trustpilot

When my GivEnergy system had an issue, I was completely left without support and had honestly lost all hope. Thankfully, I searched online and found Ron, which completely turned things around. After sending him a message, he responded incredibly fast and called me to assure me that he would get the problem fixed. I really admire his dedicated, supportive nature and his determination to find a solution. With this kind of outstanding attitude and customer service, he has absolutely secured a future customer in me.

Sree · May 2026 Trustpilot

Ron want out of is way to help, nothing was to much. He was very thorough in what he did Very knowledgeable I would highly recommend Ron and his company He did a fantastic job for me. if you have any problems, he'll do his best to help you out and resolve your problem. I wouldn't hesitate to recommend them

Dennis Brown · May 2026 Trustpilot

Ron took me through a diagnostic to confirm my GivEnergy Inverter had a fault. A common one as it turns out with the AC Inverter. As GivEnergy is defunct there is no immediate fix, aside from sourcing 2nd hand replacement. It may be that a fix becomes available over the summer which would make a lot of GivEnergy customers happy (Again)

Tony Deacon · May 2026 Trustpilot

Contacted Ron with a problem and he sorted it out quickly with no problems at all. Very knowledgeable on anything solar/ batteries. I would recommend him to anyone

Phill · May 2026 Trustpilot

I've spoken to Ron a couple of times with issues with my Givenergy installation. Such a friendly knowledge guy very highly recommended. Thank you very much for resolving my issues

michael fairhurst · May 2026 Trustpilot

Contacted Solar Tech Support in desperation. After explaining the issues I had with my system a diagnosis was made and a solution proposed. Fantastic service, even contacted a manufacturer to arrange replacement parts for me. Great communications, explained all they were doing and what I had to do, clearly and precisly. Followed up to confirm all was ok. Excellent service.

Mr Machin · May 2026 Trustpilot

After GivEnergy went into liquidation, just my luck, my battery started playing up (internal board crashed). Contacted my installer - not interested! Found Solar tech support on a Google search. Sooo glad I found this company! Ron is extremely helpful and has plenty of experience. He soon confirmed what the fault was, and helped me to get my system up and running again. Now moved my GivEnergy account to Solar tech support, and will definitely use again if I have more issues. Unusual to find such a helpful company in these times, no morons reading scripts, just direct contact with the engineer.

Keith Ballard · Apr 2026 Trustpilot

Contacted Solar Tech Support when trying to understand what my Givenergy inverter problem might be and what might be my options. Received good/honest advise which backed up my thoughts.

Hugh Speirs · Apr 2026 Trustpilot

Ron is a super star. Two months ago my GivEnergy battery failed a firmware upgrade leaving it a brick. My installer couldn't/wouldn't fix it. GivEnergy couldn't/wouldn't fix it. Then they went into administration and all hope was lost. A flurry of emails later and Ron had diagnosed the fault (failed USB flash drive, something I'd suspected) and talked me through resolving it. Two months of nothing resolved in about 3 hours. It's great to work with someone who pays attention to the details, knows that they're doing (not just following a script) and gets stuff sorted without a fuss or up-charging.

Christopher · Apr 2026 Trustpilot

I can add to the list of customers who had already 'given up' on GivEnergy due to their appalling customer service, and that was before they went into administration (their Trustpilot reviews don't lie!). So you can imagine my desperation when, having changed my ISP and my Inverter, predictably, proving to be the only device that didn't connect automatically to my new network, I found zero prospect of any customer support with GivEnergy having called in the administrators just five days earlier! The salvation came from Solar Tech Support. My IT advisor stumbled across their web site and some very helpful tips for beleaguered GivEnergy customers, as well as an offer to provide direct assistance. Nothing ventured, I decided to drop them an E-Mail, with very low expectations based on my experience of GivEnergy customer support. Within an hour Ron had responded with some pin point advice, and after a few exchanges of E-Mails he had nailed the problem, enabling the combined efforts of my IT advisor and solar installer to resolve it and reconnect my Inverter. Thank you Solar Tech Support, and Ron in particular, for coming to the aid of a deserted and despondent GivEnergy customer. Expert, razor sharp advice and first class customer service, even though I wasn't officially a customer.

customer · Apr 2026 Trustpilot

This company are a rare gem, I had a very unusual problem following a failed firmware upgrade on my GivEnergy kit. I then found out GivEnergy were in administration and had dismissed all their support staff! None of the usual fixes to try and restore my inverter comms would work, and I looked everywhere, forums, GivEnergy youtube support videos - even AI couldn't figure it out. My installer was talking about huge sums for system replacements, and being vague / evasive about if they'd even install replacement GivEnergy inverter. Enter Solar Tech Support, reassuring and knowledgeable from the very start, I've learnt loads about my solar system though the friendly chat while my engineer worked as he diagnosed the problem and figured out a fix procedure that I've not found anywhere else - amazing . If you need solar system repairs - especially if you like me have been left high and dry by GivEnergy, I cannot recommend this company enough. Give them a call.

Andy Thomas · Apr 2026 Trustpilot

I sent a message on their website regarding a problem I have on my Givenergy system. Although not supplied by Ronald, I thought it was worth an email. Within the hour on a Saturday, he phoned and we discussed the problem. He logged in remotely and gave excellent advice. I'm too far away for his on-site help but he did diagnose the problem and was happy also to chat through my thoughts about an upcoming solar/battery install I'm planning. Great bloke.... if only he was nearer!

Philip · Apr 2026 Trustpilot

I have a GivEnergy system consisting of two batteries, two inverters and a controlling EMS (Energy Management System) which has not worked since Nov 2025. After six months I discovered Solar Tech Support, reached out to them and Ron phoned me back – how often do you get that service? Could not be more helpful – worked directly with me over the phone, outside what I would call normal working hours. Lucid explanations and we were able to discuss the issues and history using camera and email history. As this was a very rare setup, Ron was able to access an EMS expert in the field to confirm the solution. One sunny day in, I am now only paying for standing charge and a few pence for spikes in grid consumption while battery catches up with house demand.

Ian · May 2026 Trustpilot

When my GivEnergy system had an issue, I was completely left without support and had honestly lost all hope. Thankfully, I searched online and found Ron, which completely turned things around. After sending him a message, he responded incredibly fast and called me to assure me that he would get the problem fixed. I really admire his dedicated, supportive nature and his determination to find a solution. With this kind of outstanding attitude and customer service, he has absolutely secured a future customer in me.

Sree · May 2026 Trustpilot

Ron want out of is way to help, nothing was to much. He was very thorough in what he did Very knowledgeable I would highly recommend Ron and his company He did a fantastic job for me. if you have any problems, he'll do his best to help you out and resolve your problem. I wouldn't hesitate to recommend them

Dennis Brown · May 2026 Trustpilot

Ron took me through a diagnostic to confirm my GivEnergy Inverter had a fault. A common one as it turns out with the AC Inverter. As GivEnergy is defunct there is no immediate fix, aside from sourcing 2nd hand replacement. It may be that a fix becomes available over the summer which would make a lot of GivEnergy customers happy (Again)

Tony Deacon · May 2026 Trustpilot

Contacted Ron with a problem and he sorted it out quickly with no problems at all. Very knowledgeable on anything solar/ batteries. I would recommend him to anyone

Phill · May 2026 Trustpilot

I've spoken to Ron a couple of times with issues with my Givenergy installation. Such a friendly knowledge guy very highly recommended. Thank you very much for resolving my issues

michael fairhurst · May 2026 Trustpilot

Contacted Solar Tech Support in desperation. After explaining the issues I had with my system a diagnosis was made and a solution proposed. Fantastic service, even contacted a manufacturer to arrange replacement parts for me. Great communications, explained all they were doing and what I had to do, clearly and precisly. Followed up to confirm all was ok. Excellent service.

Mr Machin · May 2026 Trustpilot

After GivEnergy went into liquidation, just my luck, my battery started playing up (internal board crashed). Contacted my installer - not interested! Found Solar tech support on a Google search. Sooo glad I found this company! Ron is extremely helpful and has plenty of experience. He soon confirmed what the fault was, and helped me to get my system up and running again. Now moved my GivEnergy account to Solar tech support, and will definitely use again if I have more issues. Unusual to find such a helpful company in these times, no morons reading scripts, just direct contact with the engineer.

Keith Ballard · Apr 2026 Trustpilot

Contacted Solar Tech Support when trying to understand what my Givenergy inverter problem might be and what might be my options. Received good/honest advise which backed up my thoughts.

Hugh Speirs · Apr 2026 Trustpilot

Ron is a super star. Two months ago my GivEnergy battery failed a firmware upgrade leaving it a brick. My installer couldn't/wouldn't fix it. GivEnergy couldn't/wouldn't fix it. Then they went into administration and all hope was lost. A flurry of emails later and Ron had diagnosed the fault (failed USB flash drive, something I'd suspected) and talked me through resolving it. Two months of nothing resolved in about 3 hours. It's great to work with someone who pays attention to the details, knows that they're doing (not just following a script) and gets stuff sorted without a fuss or up-charging.

Christopher · Apr 2026 Trustpilot

I can add to the list of customers who had already 'given up' on GivEnergy due to their appalling customer service, and that was before they went into administration (their Trustpilot reviews don't lie!). So you can imagine my desperation when, having changed my ISP and my Inverter, predictably, proving to be the only device that didn't connect automatically to my new network, I found zero prospect of any customer support with GivEnergy having called in the administrators just five days earlier! The salvation came from Solar Tech Support. My IT advisor stumbled across their web site and some very helpful tips for beleaguered GivEnergy customers, as well as an offer to provide direct assistance. Nothing ventured, I decided to drop them an E-Mail, with very low expectations based on my experience of GivEnergy customer support. Within an hour Ron had responded with some pin point advice, and after a few exchanges of E-Mails he had nailed the problem, enabling the combined efforts of my IT advisor and solar installer to resolve it and reconnect my Inverter. Thank you Solar Tech Support, and Ron in particular, for coming to the aid of a deserted and despondent GivEnergy customer. Expert, razor sharp advice and first class customer service, even though I wasn't officially a customer.

customer · Apr 2026 Trustpilot

This company are a rare gem, I had a very unusual problem following a failed firmware upgrade on my GivEnergy kit. I then found out GivEnergy were in administration and had dismissed all their support staff! None of the usual fixes to try and restore my inverter comms would work, and I looked everywhere, forums, GivEnergy youtube support videos - even AI couldn't figure it out. My installer was talking about huge sums for system replacements, and being vague / evasive about if they'd even install replacement GivEnergy inverter. Enter Solar Tech Support, reassuring and knowledgeable from the very start, I've learnt loads about my solar system though the friendly chat while my engineer worked as he diagnosed the problem and figured out a fix procedure that I've not found anywhere else - amazing . If you need solar system repairs - especially if you like me have been left high and dry by GivEnergy, I cannot recommend this company enough. Give them a call.

Andy Thomas · Apr 2026 Trustpilot

I sent a message on their website regarding a problem I have on my Givenergy system. Although not supplied by Ronald, I thought it was worth an email. Within the hour on a Saturday, he phoned and we discussed the problem. He logged in remotely and gave excellent advice. I'm too far away for his on-site help but he did diagnose the problem and was happy also to chat through my thoughts about an upcoming solar/battery install I'm planning. Great bloke.... if only he was nearer!

Philip · Apr 2026 Trustpilot
How to find your fault code. Solis fault codes appear on the inverter display as an error code string (e.g. "F01", "F05") or in the SolisCloud portal under Device > Event Log. The SolisCloud app also shows the fault history with timestamps. Note the exact code — including any sub-codes shown in parentheses — before contacting support.
Inverter faults

Fault codes generated by the Solis inverter in response to DC voltage issues, temperature, and hardware failures.

F01 / DC over voltage PV voltage too high
PV string voltage exceeds 600V maximum. Do not touch DC cabling. Requires engineer to check string configuration.
F02 / DC insulation fault ⚠ Insulation fault
Insulation resistance below minimum. Do not touch cabling. Check for water ingress at connectors or cable damage.
F04 / Over temperature Temperature too high
Inverter over-temperature protection. Check ventilation clearances. Clear vents of dust.
F05 / Relay fault Relay not operating
Inverter relay has not operated correctly. Power cycle. If persistent, relay board may need replacement.
F07 / AFCI arc fault ⚠ Arc fault
Arc fault detected on DC string. This indicates a dangerous electrical discharge — do not touch DC cabling. Engineer inspection required before restarting.
INI-FAULT / Initialisation fault Startup self-test failed
Inverter failed its startup self-test. Try a full power cycle (AC isolator off, wait 2 minutes, then back on). If the fault persists after a cold start, the control board or firmware may require attention — contact support with the model number and firmware version.
Grid events

Grid voltage and frequency events that cause the inverter to disconnect as a safety protection.

F12 / Grid over voltage Overvoltage disconnect
Grid voltage above upper limit. Contact DNO if recurring.
F13 / Grid under voltage Undervoltage disconnect
Grid voltage below lower limit. Contact DNO if persistent.
F14 / Grid over frequency Over-frequency disconnect
Grid frequency above limit. Transient, reconnects automatically.
F15 / Grid under frequency Under-frequency disconnect
Grid frequency below limit. Transient, reconnects automatically.
F16 / Grid lost No grid supply
No AC grid supply detected. Check the AC isolator and consumer unit main switch. If supply is confirmed present, check the AC connection to the inverter. The inverter reconnects automatically when grid is restored.
G-IMP / Grid impedance high Grid impedance too high
Grid impedance (resistance of the supply from DNO to property) is above the inverter's threshold. This is a common fault in the UK, particularly on older rural supplies or properties at the end of a long cable run. The inverter disconnects to comply with grid protection requirements. If recurring, contact your DNO to report high impedance on your supply — they can investigate the supply cable.
Isolation / insulation faults

Fault codes related to insulation resistance on the DC and AC sides of the inverter.

F03 / AC isolation fault ⚠ AC insulation
Insulation fault on the AC side — resistance between AC conductors and earth is below safe minimum. Isolate at consumer unit. Do not touch AC wiring. Requires qualified engineer inspection.
Battery / BMS faults

Fault codes from the battery management system — communication failures and voltage protection events.

F21 / BMS communication fail BMS not responding
Inverter has lost RS485 or CAN communication with the battery. Check communication cable, power cycle system. Check firmware compatibility between inverter and battery.
F22 / Battery over voltage Voltage too high
Battery voltage too high. Do not charge further.
F23 / Battery under voltage Voltage too low
Battery deeply discharged. Allow a slow charge recovery cycle.
F24 / Battery over current Current exceeded limit
Charge or discharge current exceeded BMS rating. Requires engineer.
Communication faults

Faults related to data communication between inverter and monitoring portal, and with system components.

Meter comms fail Meter offline
Export meter communication failed. Check RS485 cable or CT clamp connections.
SolisCloud offline Portal not receiving data
Portal not receiving data. Check WiFi stick LED. Reconfigure WiFi if needed via SolisCloud app.
DRM fault Demand response mode
Demand Response Mode fault, typically grid operator demand response signal. Usually clears automatically.
Code not listed here?

Solis 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.

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FAQ

Solis fault code questions

Solis fault codes appear on the inverter display as an F-code (e.g. F02, F12). They are also logged in the SolisCloud portal under Device > Event Log, and in the SolisCloud app under fault history. Note the exact F-code number and any sub-code shown in brackets — this helps identify whether the fault is persistent or transient.
F02 is a DC insulation fault — the resistance between the PV string DC conductors and earth has dropped below a safe threshold. This is commonly caused by water ingress at MC4 connectors, damaged string cable insulation, or a faulty panel junction box. Do not touch any DC cabling. Isolate the system at the consumer unit and call a qualified engineer to identify and rectify the fault source before restarting.
Recurring grid faults on Solis RHI models are most commonly caused by grid voltage at the property being consistently above 253V — a common issue in areas with high solar density where solar export is pushing local grid voltage up. Check the voltage reading in SolisCloud or on the inverter display. If voltage is consistently above 250V, contact your DNO — they may need to adjust the local transformer tap or apply a lower export limit.
Yes, persistent Solis fault codes may indicate a hardware fault with the inverter, grid relay, or DC input. STS engineers can review your SolisCloud data remotely from free and advise whether an on-site repair is needed.
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