Heating ignores thermostat in the room - how to adjust?

Update: My efforts have unfortunately brought nothing since then... Are there any other ideas?

Update: Unfortunately, my efforts have not brought anything so far... Are there any other ideas?

You have not done the homework yet. You should note all flow rates (best to post them here), then reduce the flow rates (also note the values) and give feedback after 2-3 days. If the apartment is cleverly oriented and has a lot of window surfaces, the solar gains can also heat up the “place”. Have you only been there for a few days or why is it suddenly too warm?

You haven't done the homework yet. You should note all flow rates (preferably post them here), then reduce the flows (also note the values) and give feedback after 2-3 days.

Are you a teacher? ;-) Homework is out in modern all-day/community schools – at least in Bawü as I hear :) But I have done part of the homework: The original values are in my post:

Most of the sight glass things were set to 2 liters, only one was set to 3 (2nd from the right)

BUT: Now I have noticed something new: There is something like a piston in these things, should I read at the piston mark then? These things are partly difficult to read, I was quite certainly wrong with my previous data... The pictures were taken with special lighting using an LED flashlight, otherwise I wouldn’t have even recognized the piston...

I did do part of the homework: The original values are in my post

I was pretty sure I was wrong with my previous information.

And we still don't see any before/after values.

The crucial value is at the float. The sight glasses are completely contaminated by the "rust broth," because whenever a heating circuit is completely "shut off" by the ERR, the float moves up to zero.

In addition to the flow rates, you can also note the amount of heat (daily), kWh or MWh…

You could check much more, for example whether the thermostats and controllers (valves) even work. Set to 30 degrees, then to 15 (OFF). Another person must then have their ear on/in the HKV and locate the corresponding "actuator" and check if the flow changes…

If I see that correctly, the system is only about 10 years old…