What is the temperature that the boiler "sees" because it sees perhaps 20 ° and you cannot blame it. it depends on where the thermostat is placed, whether it is properly calibrated or not, etc.
The boiler sees the same temperature as me in the house, I checked it several times.
This morning it was 21 ° when I left at 8am and there it is 21 ° 5 so it's better than yesterday or we had this feeling of suffocation.
When my heating engineer is very available and would come back to make changes if I ask him but I also need to know how to do some stuff myself because I will not disturb him every week because I am too hot or cold. I note on a notebook my statements and my mods and when it comes I show him. He only installed 4 so he is a little groped too, he also asked me the link to follow the thread of this discussion because I told him that you give a lot of advice and that for some it was too complicated for me (blondie the return )
I'm waiting to see Didier's advice to see if it is properly calibrated.
Thanks for your help boys.