Underfloor heating air-water heat pump. House too warm when the sun shines

I would currently regulate very cautiously. The bedroom is now heated, with the current outside temperatures (we had 15 degrees yesterday) it does not cool down drastically overnight. You could even turn off the heating and still have too much warmth in the room. Therefore, it doesn't make much sense to regulate heavily against it now. If it gets colder again, there is a risk that you overdid it and the room becomes too cold again.

then just completely close the one in the dressing room and bedroom... and if you then notice something, you adjust it step by step to the desired temperature

But I thought that under no circumstances should everything be closed?

I would currently only regulate very cautiously.

The bedroom is now heated, with the current outside temperatures (we had 15 degrees yesterday) it does not cool down rapidly from one day to the next. You could also turn off the heating completely and still have too much heat in the room.
Therefore, it makes no sense to regulate heavily against it now. If it gets colder again, there is a risk that you overdid it and it will be too cold in the room again.

You are right. Our heating engineer will come by again in the next few days; he should at least take a look at the living room and bathroom, because at 20.8° it is simply too cold for me in the bathroom.
If necessary, I will really just turn off the bedroom heating completely. Because when you go from this sauna to the bathroom in the morning, you get chills.

A minimum flow rate must be present. How warm is it with you now, also 15°C?

A minimum volume flow must be present. How warm is it with you now, also 15°C?

No, we currently have 7 (Rhineland Palatinate)

Then I’ll wait for the table... Again about the bathroom. I see that critically, 3 exterior walls, roof and floor., hardly any adjacent heated room., probably also no underfloor heating under the bathtub and shower yet. So little heating surface for the room with the highest heat demand. A wall heating should have been installed here to meet the heat demand. At least you can heat up on demand with the towel radiator. Do you leave the door to the hallway open? I would do that during unused times so that warmth from the hallway can flow into the bathroom.