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Finally got this sorted. Got the plumber to check out the feed pipe where it tee'ed in next to the vent pipe. It was solid with black sludge that had set like concrete. Once the pipework was replaced no more pumping over and the central heating works better than ever. Thanks for all the help guys!

Thanks for the replies all. Good diagram by Chris but the pump is fitted the correct way round (The arrow is pointed away from the feed pipe). The system is overpumping through the vent pipe into the F&E tank. I am getting the plumber back in and as it's 12 rads will "negotiate" as suggested. I...

Been having a lot of problems with my Central heating recently. Started when I replaced a bathroom radiator and when I refilled the system some of the radiators would not get hot. Called a plumber who diagnosed a powerflush was required. £450 later I still had three cold radiators. After a row...

If I bleed the rads I get clean water out (no air). I'll try the basics next.

Thanks for this, If I can't get him back to sort the problem I'll start with the basics (turn off all the working radiators and leave one non working one on etc) and then move on to your suggestion as a next step.

He got quite a lot out with the Powerflush. He advised not to do it again as it would weaken the joints too much. I've just checked the header tank and there's still C*** in the bottom. Don't know if he reversed the flow at all but he did use decent chemicals. I'm trying to get him to come back...

Can anyone help with a cold radiator problem. I fitted a new bathroom radiator having drained down the system first. When I refilled the system only the upstairs radiators came on. I called out a plumber who diagnosed that the system needed powerflushing. (It's an 8mm microbore system). He did...