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gas4u and nickso. thanks for your help, my CH appears to be working again now after I followed your instructions. you probably saved me a fortune! cheers

okay, well it was reasonably loose I think, but I've oiled it up a bit, and then put it back together. when i switched it back I pulled the black lever on the side up, and it sounded like some water got release or redirected somewhere. I think the CH and HW are now working independently...

Sorry if I sound like a dunce :D Is that the circular metal thing in the centre? I did try taking it apart but didn't look closely at that bit. Does it just pop apart? EDIT...There's a little spnning cog at the back of it, which has grease on it. Is that what we're talking about it...

Is it possible to manually move it until I get it fixed properly?? And back to my last question, how much should I expect to pay to get it fixed (or should I try to fix it myself)??

Thanks for replying. So do you think the mid-way valve is definitely at fault then? How much would I be looking at to get a plumber in (South Cheshire area), as I don't think I'd be comfortable draining the system myself?

Okay, after browsing the forums I think my mid-postion valve is faulty, but I wanted to check before deciding what to do next. The symptoms are... - CH comes on when only HW is selected (i.e. I cannot turn my hot water on without the rads getting hot). HW also comes on when CH is on, but I...