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Haven't had a chance to take an pictures, but I did trace the cold feed from the expansion tank down to the first "T" and applied a magnet which is drawn to this connection. I guess that means i have a blocked cold feed, so I (hopefully) have a guy coming out to look at it today. I'll keep...

I checked and I don't have a vent pipe over my expansion tank. The tank has in inlet (with a ball valve) at the top, and the a feed out of the bottom. It had a jacket on it, with a foam lid. It's an old servowarm install, should this be something I should worry about?

Thanks for the replies. It occured to me that I'm trying to bleed the rads with the heating off. Am I right in thinking that the 3 port valve "rests" supplying the hot water? If so then I'm not likely to be able to bleed the radiators without turning the valve to manual or similar. I'll have...

Anyone else? *bump*

Thanks for the reply Bobbo. The expansion tank has water, and depressing the ball cock makes it fill. The tank has 2 pipes of similar size going in; one at the top where the ball valve is, and one at the bottom under the water. There's also an overflow. The boiler and pump are off when I...

Hi All, I've search and searched this site, and found lots of good information, but I have a few specifics about my particular problem if you have the time to answer... A plumber just came and fitted an automatic 3 way valve in place of a manual one for me. To do this he drained the...