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Thanks Tony, I do live on mother earth and did flush out the system before the new boiler was fitted. However, I did not remove all the rads and clean them individually and then individually flush out each flow and return pipe as I have done now. I do admit to not getting the boiler serviced...

That wasn't very nice Boilerman2, I thought you were going to try and be helpful. Sorry I ruined your day. :cry: :? Anyway, an update. removed and flushed the three downstairs rads, also flushed flow and return pipes to each rad. I reinstalled the rads, filled the system and bled the rads...

Tried a bit of balancing on the rads, but kept falling off. :wink: Attempts at balancing did not improve the situation, and just threw up more problems than it sorted. I would link to my other thread if I new how, but its further down the page. Edit. This may work...

I just needed this basic info to clear up confusion when I rebalance my system. Please see my newer thread. allan

Abot 2 years ago I had a Glow worm Ultracom 12hxi fitted in my 3 bed house. Everything was fine and dandy until recently. The first sign of a problem was cooler radiators. (used to be hot) I changed the pump as the other one was a bit noisy and I thought maybe it was not up to its job anymore...

Hi all, I need some real basic info to start with, and then I'll get to the problem in a new thread. At which side of a rad should the LS valve be. Some of my rads have it on the flow side, and some on the return side. Does it matter which end of the rad the flow is restricted from. Must...