Hi,
This morning I updated my Multi-RS units (A443 units) to firmware 1.29. One unit is now stuck in this error “#59 ACIN1 relay test fault”.
It looks like this issue: Error #59 ACIN1 relay test fault on firmware 1.27 , but I encounter it on 1.29.
It has been working without any issues on 1.26 - 1.28 versions.
I have a 3-phase setup, and now the entire setup disconnects, because of 1 unit with this issue.
Anything changed in this area that can explain this?
From the release notes…
v1.28 – 30 January 2026
This release is made only for the Multi RS.
Changes applying to Multi RS:
Fix issue causing incorrect alarm ‘Error Code: #59 - ACIN1 relay test fault’ on some installations
If a Roll back to 1.28 doesn’t solve it then you may have actually have a hardware fault.
Usually its not a good idea to update a working system though, what was your reason for running the recent update?
In the 3 phase system I encountered sometimes a random disconnect, and according to the release notes this was solved with this release.
Hmmm. So there was already a bit of a problem there. Not we need to workout if it is hardware or firmware.
Do the spurious disconnects happen 1.26 or older?
Rollback to 1.28 and 1.26 did not make a difference, #59 kept popping up on startup.
Don’t know of it was happening on 1.26 or older, the system is only running for a month or 2 now, and I never really ran with 1.26
Interesting. Does it self clear or just stay there?
Not sure what you mean though, but when I start up the unit, it does the usual rattling, pops up with the mesage that acin relay is open, then somewhat later the error message pops up. That message stays there.
Although the screen rotates around the messages
Does the unit connect’s to the grid and uses it after the ‘rattling self test’?
What i am trying to establish is if the messge is spurious or there is a hardware problem.
If it is hardware then the unit goes for a warranty assesment if it is a message displayed that does not need to be there then more investigation needs to be done.
I do not think it really connects. It shows the AC-In voltage etc. It does the self test, and then reports the error. I do not see it actually close the connection to the grid.
At this moment it does not look spurious, every start up results in the same behavior.
Weird though that it only started having this issue immediately after upgrading to 1.29. First startup was immediately troublesome.
The spurious disconnect really happened once in a while, no big issue, just thought the firmware upgrade would improve that.
Sometimes coincidence.
I think you are pretty much at the point of an RMA as there is not much more that can be done. The other reason being you were already having some issues before this. Not big ones but still creates the suspicion.
Hi,
I created from the advanced page a screenshot from the internal relay state. Is this the relay we are talking about? And if so, isn’t it actually closing for some time? Not sure what I am actually looking at.
No.
The graphed state is for the user relay, the one that has the contacts exposed on the user I/O connector.
Your problematic relay is the one that’s disconnecting the input of the Multi RS from the grid.
in reality are 4, because of the norms.
Alex pescaru is correct.
Thats a different relay.
Yeah… Any one of the 2 could be an issue.
On the GUI it will just say disconnected.
If it does not behave even in stand alone. Then basically return to supplier.
No, really… they are four (4) independent ones… 
Two in series on the live and two on series on the neutral, just like on the schematic.
And as the relay board is an independent one, it can be taken out and examined/tested.
I would do that for my system, but I am not encouraging anyone to do the same… 
Lol true.
I was thinking of the 2 on each of the lines they disconnect not the total physical set up.
The other thread the firmware cleared the error fault. So i do believe a physical problem has appeared on @Rbo’s set up.
Even in standalone it does not work…
Thanks for the clear explanations 
Now I have to go through the hassle to remove it from the wall again, and send it back somehow.
But, it is what it is…
Thanks!
If it was not such a new unit, and if there was no warranty, I would probably have done the same… 
