Properly setting the air-to-water heat pump with underfloor heating

No idea what this is... I had hoped you would get more flow when you turn it on. Unfortunately, I didn't find any fuse, I'll set it to 0! Thanks!

Looks like a differential pressure bypass valve.

If it is a [Überströmventil], it opens earlier when you turn it further. Try closing it step by step and observe the flow in the tubes. Maybe you can get a little more flow. Remember the current setting, then you can always reset it. I was able to increase the flow from 1200l/h to over 1800l/h by closing the [Überströmventil] on my system...

If you had simply called the local heating technician, he would have fixed the problem in an hour and for 44.72 euros. That would have saved you the adjusting, rearranging, and trying out for the fifth day in a row....

If you had just called the local heating technician, he would have fixed the problem in an hour and for 44.72 euros. That would have saved setting, adjusting, and trying out for the fifth day in a row....

Haha that was good, never.

I already called, my appointment is on 01/10. But I think if you roughly set it in the right direction beforehand, it will be easier for the technician! By closing the valve, do you mean setting it to lower pressure?