I am happy with the ac/DC valves done my head in the call sounds like its gonna take off "oh yes its the commonhurtuish effect turn it up the trv and give it 2 years (until guarantee is over) bye
How unprofessional that's why I'm the god of installation's I use my thermometer and find the coldest part of the room and fit the trv as close as I can its called the reduredsere effect every good fitter knows this it has the user only at the temp need be I have never had a chattering valve I...
Sorry haven't read all your post just a quick thought I'd balance the system just close all l/shields and when cold open l/shield just a bit until you feel rad getting hot only a turn should do it just stops rads getting robbed