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!