Use the ERR cable for other purposes

He probably only unplugged them mechanically and not electrically. Since each actuator usually needs about 2W, that's a constant 20W for 10 actuators. That's why I have them all normally open without power. If it has its own fuse, I would just remove it.

I have a fuse "HKV". Can I just turn it off? Is there nothing else connected to it besides the actuators?

I have a fuse "HKV". Can I just turn it off? Is there nothing connected to it besides the actuators?

Only you or your electrician probably know that. But trying it won't cost anything!

Only you or your electrician probably know that. But it doesn’t cost anything to try!

Not me. And the electrician? Well, I don’t think so either.

But "the Internet" should know how you wired, secured, and labeled it?

But "the Internet" is supposed to know how it was wired, secured, and labeled at your place?

Nah, it could just be that you can generally say, if it says HKV on it and it was wired professionally, nothing else should be connected there. Or the other way around, no, there definitely has to be something else connected there… the heating absolutely needs that.

Yes, I only unplugged the actuators. They are closed without power, which is why the ERR is 1 everywhere. I just have to keep an eye on it occasionally, so the kids don’t mess with it. This isn’t noticeable when the actuators are unplugged.

I don’t think there is an extra fuse; they run on the heating circuit. I only have an extra fuse for the heating element, which is permanently off.
In addition, I currently have 2 more or less actuators in operation.
My wife couldn’t bring herself back then to make the bedroom and guest/study room unmanageable. The guest/study room was rarely used before and therefore kept a bit cooler, but it is now regularly in use and has been running at normal temperature for quite some time. The actuator could also be unplugged there. The bedroom still needs fine-tuning but could also be unplugged.

That’s why I was considering whether the cables could be used for something useful. However, I didn’t come up with a really good idea.