Turn on the underfloor heating at the controller

How about a few photos?

A picture is worth a thousand words. So

Unfortunately, I can't take proper photos because a cabinet next to it is in the way.

All flow indicators are at 0, all the way at the top. The blue adjusters can be turned but then fall off.

Today I also only noticed the moisture on the wall. I don’t know exactly where it’s coming from.

So the actuators are missing here. Or the heating technician has a plan and only did the thermal balancing using the valves.

Can you please take pictures of the entire distributor? Is the return and supply for both ovens the blue and red on the valve that looks like a T?

And now look for another lever on the riser.

Has it already run once?

Do you see a pressure valve anywhere in the basement?

Did it run once already?

Yes, right at the beginning, after the installation 3 years ago.

Attached are the photos from the technical room where everything is installed. I see that a riser (red) is shut off. This can be seen at the very top in the second photo. I will open the valve and then see what happens.

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Turn to 1 first, then 2. But stay with it and watch if anything is leaking.

First turn on 1, then 2.

Thank you! I will try that this afternoon after work.