We recently installed some underfloor heating for a customer. I've not done it before so enlisted some help of another plumber friend of mine. Problem. Heating only = fine. CH and ufh= fine Ufh only = brings ch on too and can't be switched off on the room stat and rads get extremely hot. I've not had a chance to get back but any ideas? We put a 2 port in for the Ufh as there wasn't one supplied with the pack.