I have a gateway model evohome and HR80 radiator controllers, I have just added a radiator with a HR92 and bound it to a zone that already has 2 HR80s in it, I also changed it to a multi room zone at the same time. The problem is that one of the radiators is cold and the other two don't seem to turn off at all - is it OK for me to mix the HR80 and HR92 in the same zone or should I put the HR92 in another single radiator zone and have 3 HR80s in the one zone?