Yesterday morning I found the inverter was offline with "SCI Fault" on the display panel and had been since about 4am. I tried a cold restart and that fixed it and it worked for the rest of the day.
This morning I found the inverter offline again, since around 1am. Tried a cold restart but SCI fault came back immediately (before inverter would produce any power).
I emailed Fox support this morning but not expecting a reply back until Monday. It would be a sunny day today wouldn't it!
But I have just discovered while looking back through home assistant activity logs for the inverter Manager Firmware that it seems a firmware update must have happened at 03:13am yesterday as the Manager firmware changes to 1.69. Prior to that on 24th February it was 1.58 which I think it's been on since May last year when I requested Fox to update a new install with the latest firmware. So a firmware update has been sent but I didn't request one and I doubt my installer has done it (small chance but I suspect not).
I wonder if anyone else has had any similar issues and what was required to fix it? At this stage I'm suspecting either firmware files provided by fox to put on a USB stick or an inverter replacement.
Since I didn't know what a SCI fault is I did a quick search on DuckDuckGo and this link came up, hope it helps.
Thanks for that. I had a look at that video on Friday morning but it was useful to have another look at it.
I should have mentioned on my original post that yes my inverter is showing the master and slave firmware versions are 0.00. Hopefully Fox support can fix it remotely when their support office opens.
I should have mentioned on my original post that yes my inverter is showing the master and slave firmware versions are 0.00. Hopefully Fox support can fix it remotely when their support office opens.
Curiously I have exactly the same issue. Manager was updated to 1.69 on 1st March without my knowledge. Now getting an SCI Fault. Would be interested to know what you find out (about to contact installers myself). It would seem that something strange going on at the Fox end of things.
I do wonder whether the Modbus adaptor may have interfered with the process. I'm not sure if you're supposed to power this down during a software update (I didn't as I wasn't informed an update was going to take place).
I did wonder if other people were affected if Fox were pushing out updated firmware as some matter of course.
In addition to emailing Fox support on Saturday morning and getting a ticket # back, I tried calling their UK support phone number 5 times today and each time got put into a queue for the next agent and then after about a minute it said all agents are busy with other customers, please leave a message (which I did on the last call attempt). I've had nothing back from Fox today (no email, no phone call). I tried also calling the Electrician (who was appointed to do the original install last April) around lunchtime but he didn't seem to know SCI fault and I told him that re-sending firmware may help and he said he'd call Fox to get them to do another firmware update (shouldn't he have an agent account where he could do this himself?!). He asked me to message him serials which I did but the messages haven't been read as yet (given it's 7pm hopes are pretty low).
It's frustrating that I am prevented from attempting a firmware update myself and have to rely on other people (Fox and Installer) and both have done nothing today. And I have to wonder how long might it take for anyone to do something?
Of course it being a lovely sunny day with the best predicted generation of the year today did not help either.
It's an interesting point about the Modbus adaptor. I have no idea if that should be powered down but given the update happened out of the blue there was no chance of even thinking about that (not that I would have).
My last point is I wonder if more than just a few have had problems and that's why Fox haven't got back yet.
I'll update this thread with progress as it happens so others might see timelines or what was needed to fix.
In addition to emailing Fox support on Saturday morning and getting a ticket # back, I tried calling their UK support phone number 5 times today and each time got put into a queue for the next agent and then after about a minute it said all agents are busy with other customers, please leave a message (which I did on the last call attempt). I've had nothing back from Fox today (no email, no phone call). I tried also calling the Electrician (who was appointed to do the original install last April) around lunchtime but he didn't seem to know SCI fault and I told him that re-sending firmware may help and he said he'd call Fox to get them to do another firmware update (shouldn't he have an agent account where he could do this himself?!). He asked me to message him serials which I did but the messages haven't been read as yet (given it's 7pm hopes are pretty low).
It's frustrating that I am prevented from attempting a firmware update myself and have to rely on other people (Fox and Installer) and both have done nothing today. And I have to wonder how long might it take for anyone to do something?
Of course it being a lovely sunny day with the best predicted generation of the year today did not help either.
It's an interesting point about the Modbus adaptor. I have no idea if that should be powered down but given the update happened out of the blue there was no chance of even thinking about that (not that I would have).
My last point is I wonder if more than just a few have had problems and that's why Fox haven't got back yet.
I'll update this thread with progress as it happens so others might see timelines or what was needed to fix.
My 'Master' firmware updated overnight and the inverter is now functional again. The 'Slave' unit is still awaiting an update, and I can now do this through the updated app (though have not dared to do so yet).
From reading other forums and Facebook groups, it seems that lots of people are having various issues these last few days, so I guess Fox may be somewhat overwhelmed at the moment.
As an aside, after the latest update my Export and Import limit had both been changed to something inappropriate (pretty dodgy if you don't notice the export limit change as this can cause problems with your supplier).
From reading other forums and Facebook groups, it seems that lots of people are having various issues these last few days, so I guess Fox may be somewhat overwhelmed at the moment.
As an aside, after the latest update my Export and Import limit had both been changed to something inappropriate (pretty dodgy if you don't notice the export limit change as this can cause problems with your supplier).
Do you know what caused your master firmware to update overnight?
I've had a look in the iOS app and Fox Cloud but don't see options to update Inverter firmware. I did see an update for the datalogger which I've done.
I suspected they are overwhelmed for one reason or another but thanks for reporting on the social posts you've seen.
I'll have to keep an eye on export/import limits when it comes back on line.
I've had a look in the iOS app and Fox Cloud but don't see options to update Inverter firmware. I did see an update for the datalogger which I've done.
I suspected they are overwhelmed for one reason or another but thanks for reporting on the social posts you've seen.
I'll have to keep an eye on export/import limits when it comes back on line.
No, it just seemed to happen overnight. Previously only the 'Manager' firmware seemed to have updated and the others (Master and Slave) were showing as version 0.0 in the app (and were not updateable). This morning the 'Master' version had updated and the 'Slave' firmware was now marked as 'Update available'. I have now updated the Slave firmware via the app and it all seems to be working as expected (other than the change to the 'Export Limit').
I got a reply from Fox technical support to my email ticket created on Saturday.
They asked me to isolate the Battery, Solar DC and AC so the inverter was fully shut down and then wait a day before turning them back on again. Then they will try to perform the upgrade operation again.
Not sure quite why it needs everything fully shut down for a day before they can do that. But with some luck maybe there'll be some progress tomorrow.
They asked me to isolate the Battery, Solar DC and AC so the inverter was fully shut down and then wait a day before turning them back on again. Then they will try to perform the upgrade operation again.
Not sure quite why it needs everything fully shut down for a day before they can do that. But with some luck maybe there'll be some progress tomorrow.
A whole day?! I can't imagine what that would achieve unless they think it is overheating.
Yeah, I can't even imagine why. Seems quite dubious but maybe there are some odd reasons why that might be so (I'm giving quite a bit of benefit of the doubt here).doogledog75 wrote: ↑Tue Mar 03, 2026 5:05 pm A whole day?! I can't imagine what that would achieve unless they think it is overheating.
I can't see why it would be overheating given the Inverter is shut down and it's not exactly hot outside.
I also note that on the app and cloud website it says everything is "Normal" with my plant and then when you hover over it it says something like "there be errors". I'm not sure I'd classify the current state as normal.
I'm glad I'm not the only one. My inverter reported the SCI Fault with a code 11 on the app. This happened at 0130 March 1st and a reboot sorted the problem out for 24 hours. The same thing happened the following morning and this time rebooting failed to clear the problem. I contacted both installer and Fox. The installer mentioned that this has become an issue for several clients and they are awaiting direction from the manufacturer.
My H1 G2 (6kw) also got forcefully updated to 1.69 on Manager overnight last night, and has been in the SCI Fault state ever since.
Called fox support who pushed the update again, which failed, and then they asked me to do a shutdown and startup again which also made no difference. They've then asked my to contact my installer (left a voicemail...) so that they can be on site to "do some tests" while on a call with a Fox engineer to determine if anything needs to be replaced.
Not happy at all as I've missed out on an entire day of solar generation, not to mention been running off the grid since about midnight last night which will come at a pretty decent cost to me given its 29.2p/unit on peak.
Starting to wish I had blocked the inverter from internet access a long while ago like I originally planned to, given I have modbus with home assistant for data anyway.
Incredibly misguided from Fox to randomly decide to push out updates like this, in fact I had just noticed the other day in the Fox app that updates were available and thought to myself "I won't do that as it's working fine anyway". I was running Manager: 1.48, Master: 1.31, Slave: 1.02
Called fox support who pushed the update again, which failed, and then they asked me to do a shutdown and startup again which also made no difference. They've then asked my to contact my installer (left a voicemail...) so that they can be on site to "do some tests" while on a call with a Fox engineer to determine if anything needs to be replaced.
Not happy at all as I've missed out on an entire day of solar generation, not to mention been running off the grid since about midnight last night which will come at a pretty decent cost to me given its 29.2p/unit on peak.
Starting to wish I had blocked the inverter from internet access a long while ago like I originally planned to, given I have modbus with home assistant for data anyway.
Incredibly misguided from Fox to randomly decide to push out updates like this, in fact I had just noticed the other day in the Fox app that updates were available and thought to myself "I won't do that as it's working fine anyway". I was running Manager: 1.48, Master: 1.31, Slave: 1.02
The only thing that comes to mind is it'd fully discharge capacitors.doogledog75 wrote: ↑Tue Mar 03, 2026 5:05 pm A whole day?! I can't imagine what that would achieve unless they think it is overheating.
Yes that's exactly what I had. Cold reboot the first day fixed it and then the next night it broke again and cold reboots didn't fix it any more (I tried a few times over the next few days).gazidoc wrote: ↑Tue Mar 03, 2026 7:03 pm I'm glad I'm not the only one. My inverter reported the SCI Fault with a code 11 on the app. This happened at 0130 March 1st and a reboot sorted the problem out for 24 hours. The same thing happened the following morning and this time rebooting failed to clear the problem. I contacted both installer and Fox. The installer mentioned that this has become an issue for several clients and they are awaiting direction from the manufacturer.
At the rate we're going it's going to be almost a week without any battery or solar and havnig to pay peak rate electricity in the meantime which is far from ideal. I wish Fox would have responded a lot faster because this sort of thing matters to customers. But I'm sure they're trying their best and probably a bit of a surge of issues at the moment as well as rapid growth in the market.
I tried calling Fox many times over the last few days but could never get through to anyone. I left a voicemail when their system prompted me to after a minute's wait in the queue. Not sure what you're trick wasbfayers wrote: ↑Tue Mar 03, 2026 7:30 pm Called fox support who pushed the update again, which failed, and then they asked me to do a shutdown and startup again which also made no difference. They've then asked my to contact my installer (left a voicemail...) so that they can be on site to "do some tests" while on a call with a Fox engineer to determine if anything needs to be replaced.
I have a nasty feeling they're going to be unable to fix it remotely and that's going to be a right pain I suspect. Getting the electrician installer back - who's paying for his time?
I pressed 2 in the phone tree for "firmware update to enroll in Octopus flux" (I don't want flux but it seemed relevant) and it went through after a few minutes on hold.
As far as I'm concerned it's warranty work
. Fox can foot the bill.They've also responded to my online Ticket this morning saying they want to push the firmware again, unbelievably they responded in the few minutes i had the system shut down to try another reset, I let them know 10 minutes later it was back online about 5 hours ago now and no follow up (and no firmware push) yet.
I reckon they've bricked a lot of setups the last couple days. Once I'm up again, be that with a new inverter or otherwise, I'll be blocking it from the internet so it can't happen again.
I’ve had the exact same issue. Got told to turn off for a day, turned back on today and upgrade attempted and failed again. Been told a replacement is needed.
Got in touch with the installer I used last year (as I upgraded from gen1 to gen2 last year) and forwarded all the email comms to them.
Not sure on process or timelines for the replacement to arrive or installer to come and fit.
Will be blocking the datalogger, I didn’t want to upgrade and it’s very frustrating. I’m expecting over a week of full peak usage which is quite costly. And also typically this week we’ve started decent sunny spells as well!
Got in touch with the installer I used last year (as I upgraded from gen1 to gen2 last year) and forwarded all the email comms to them.
Not sure on process or timelines for the replacement to arrive or installer to come and fit.
Will be blocking the datalogger, I didn’t want to upgrade and it’s very frustrating. I’m expecting over a week of full peak usage which is quite costly. And also typically this week we’ve started decent sunny spells as well!
So I just had a reponse back from Fox at lunchtime today which said they have decided to replace the inverter and a form to fill out. I wasn't sure whether to contact the sub-contracted electrician that actually installed the inverter or the company that managed everything but after advice from a friend I contacted the company that was contracted for the whole install. They said they'd get the installation team to get back to me and suspect this was the right call. No idea how long it'll take for Fox to send a replacement or for it to get swapped over by someone but I suspect at best it's a week or two but probably a bit more.Mikegoodwin wrote: ↑Wed Mar 04, 2026 8:12 pm I’ve had the exact same issue. Got told to turn off for a day, turned back on today and upgrade attempted and failed again. Been told a replacement is needed.
Got in touch with the installer I used last year (as I upgraded from gen1 to gen2 last year) and forwarded all the email comms to them.
Not sure on process or timelines for the replacement to arrive or installer to come and fit.
Will be blocking the datalogger, I didn’t want to upgrade and it’s very frustrating. I’m expecting over a week of full peak usage which is quite costly. And also typically this week we’ve started decent sunny spells as well!
Not exactly happy. It's irritating thinking now of how much electricity I'm consuming at peak rate and nothing I can do about it. Of course it would be just when the weather gets better to really rub it in.
Somehow I knew that it wouldn't be as simple as remotely fixing anything. It never is!
Same here, not sure when they'll send it out as yet or who they expect to install it, probably my original installer company, but they're yet to get back to me too due to high demand. In half a mind to just do it myself since all the connectors are preterminated and it can't be that hard but I probably shouldn'tjalbo wrote: ↑Thu Mar 05, 2026 2:02 pm So I just had a reponse back from Fox at lunchtime today which said they have decided to replace the inverter and a form to fill out. I wasn't sure whether to contact the sub-contracted electrician that actually installed the inverter or the company that managed everything but after advice from a friend I contacted the company that was contracted for the whole install. They said they'd get the installation team to get back to me and suspect this was the right call. No idea how long it'll take for Fox to send a replacement or for it to get swapped over by someone but I suspect at best it's a week or two but probably a bit more.
Not exactly happy. It's irritating thinking now of how much electricity I'm consuming at peak rate and nothing I can do about it. Of course it would be just when the weather gets better to really rub it in.
Somehow I knew that it wouldn't be as simple as remotely fixing anything. It never is!
Share the same sentiment about how much money is being wasted on the first truly nice week this year, typical. Would be nice if we can convince fox to reimburse for the additional energy bill spend though I doubt there's much chance of them agreeing to that without a small claims case.
I did wonder about swapping it over myself as well and as you say can't be that hard - all the cables are terminated with connectors on and the existing bracket is already mounted on the wall. So I'd think it'd be easy. But I think there are some inverter settings that may need to be set for UK grid so it's probavbly better it's done by somoene who knows what they're doing. Having said that it wouldn't be hard to go through the existing inverter menus and note down the existing settings. One of my biggest frustrations is when I'm dependant on someone else do do something when I feel technically capable of just doing it myself (same situation with sending latest firmware although for all of us that's a sensitive subject at the moment!).bfayers wrote: ↑Thu Mar 05, 2026 2:08 pm Same here, not sure when they'll send it out as yet or who they expect to install it, probably my original installer company, but they're yet to get back to me too due to high demand. In half a mind to just do it myself since all the connectors are preterminated and it can't be that hard but I probably shouldn't
Share the same sentiment about how much money is being wasted on the first truly nice week this year, typical. Would be nice if we can convince fox to reimburse for the additional energy bill spend though I doubt there's much chance of them agreeing to that without a small claims case.
It would be nice of Fox to re-imburse for extra peak costs but no chance of that.
I just thought I'd post an update.
The Installer company didn't call back after my initial call to them on Thursday afternoon last week. I sent a follow up email on Friday afternoon. After no contact still by today I called again and was told it was with their installation team and they'd ask the contact there to get in touch. Still nothing.
It looks like Fox have another issue that started today impacting cloud data and battery reports - as far as I can tell from forum posts here.
I'm not sure how widespread issues similar to mine resulting from firmware updates that have either caused issues that can be remotely fixed or resulted in broken inverters but it seems the issue today is fairly widespread. They're not having the best time at the moment.
It would be nice to see some statements from Fox UK - the radio silence is not ideal.
I was hoping for my installer to advise on filling out the replacement inverter form but given a week has passed with no input I've just filled that out myself now. We'll see what happens. My hope is a new inverter magically arrives in a box and then it's just a separate case of getting it swapped over. I am seriously wondering how easy/viable it is for me to swap it over myself and what I might need - I'm guessing an MC4 disconnect tool, not sure about the other connectors (eg the big AC connector). And I don't know about re-registering the new serial against the datalogger/system/plant - but I imagine fox can probably help with that. Any input from people who have self-installed or swapped themselves would be greatly appreciated.
The Installer company didn't call back after my initial call to them on Thursday afternoon last week. I sent a follow up email on Friday afternoon. After no contact still by today I called again and was told it was with their installation team and they'd ask the contact there to get in touch. Still nothing.
It looks like Fox have another issue that started today impacting cloud data and battery reports - as far as I can tell from forum posts here.
I'm not sure how widespread issues similar to mine resulting from firmware updates that have either caused issues that can be remotely fixed or resulted in broken inverters but it seems the issue today is fairly widespread. They're not having the best time at the moment.
It would be nice to see some statements from Fox UK - the radio silence is not ideal.
I was hoping for my installer to advise on filling out the replacement inverter form but given a week has passed with no input I've just filled that out myself now. We'll see what happens. My hope is a new inverter magically arrives in a box and then it's just a separate case of getting it swapped over. I am seriously wondering how easy/viable it is for me to swap it over myself and what I might need - I'm guessing an MC4 disconnect tool, not sure about the other connectors (eg the big AC connector). And I don't know about re-registering the new serial against the datalogger/system/plant - but I imagine fox can probably help with that. Any input from people who have self-installed or swapped themselves would be greatly appreciated.
I filled out the form on Thursday morning, a new inverter appeared on Saturday afternoon courtesy of DPD. Waiting on a response from my installer now to get it swapped over... May take a while since I suspect they're inundated by Fox requests.jalbo wrote: ↑Wed Mar 11, 2026 6:14 pm I was hoping for my installer to advise on filling out the replacement inverter form but given a week has passed with no input I've just filled that out myself now. We'll see what happens. My hope is a new inverter magically arrives in a box and then it's just a separate case of getting it swapped over. I am seriously wondering how easy/viable it is for me to swap it over myself and what I might need - I'm guessing an MC4 disconnect tool, not sure about the other connectors (eg the big AC connector). And I don't know about re-registering the new serial against the datalogger/system/plant - but I imagine fox can probably help with that. Any input from people who have self-installed or swapped themselves would be greatly appreciated.
Well that is quite re-assuring and is a lot faster than I would anticipate! Appreciate that info.
Yeah, it hadn't really occurred to me until today that the reason my installer has been fairly silent is they may have quite a surge in various issues over the last week or so and just taking time to get round to dealing with everyone - at least I hope that's the reason.