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hmmm ok i do have a 3 port valve but it seems to work (i mean move across) as the heating comes on, and the hot water comes on (rest position this is i believe). the cylinder stat? how would that cause this problem though.... the programmer also seems to be fine as we get them...

I don't know if anyone can help me, who may have come across this problem before? This started to happen about a month ago: i have a gloworn boiler and my system is open, i have 2 tanks in the loft space. i can get heating ok and hot water ok, but when both are on together i only get...