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Yes I think I can see that’s a distinct possibility now. As long as I can see the problem I can then decide the best way forward in changing my runs to properly elevate my mistake. All the help I have received here is very much appreciated. :D

OK thanks Dan, I will now study your arrows and try to understand how come. :roll:

Yes but I cannot perceive how (which route it would take) the water could travel the wrong way, to me looking at the diagram I just can’t see it, I know it’s happening but how? :o

In the summer unless I lock shield them off I get some radiators hot when only the DHW is on (all CH. Off) I think I know what my problem is, my son has read that when I installed my own CH System I should have brought the HW cylinders return out so it was the last connected returning to the...