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Thanks for reply ChrisR I've done as u suggested, turned off lockshield valves on hot rads, but other rads do not seem to have improved. The boiler is near the house in an old shed, and I can hear noise through the pump pipework, sounds like air or something, though I've bled all rads. 3 rads...

Hi, I contacted this forum a few months ago about problems with some radiators being cold (mostly downstairs) and it was suggested that sludge was blocking these rads. From the good advice i got, I used a litre of sentinel X400 in the system for a month, flushed it out and refilled. I also took...

Thanks guys for great advice, I think though I'll wait till the weather warms up before starting work on this.

Thanks for good advice. Where can I get a Magnaclean, and where does it need to be installed ?? If I flush the rads outside how do i know that all the much is cleaned out. ( Do I need to tap them to loosen the muck or something.) Proves how little I know about this doesn't it! Someone...

I moved into an old house a few years ago, and inherited an old oilfired boiler feeding about 12 radiators. Only one or two radiators gets very hot (nearest the boiler) rest of them warm, with several cold. Bleeding the rads made no difference In an attempt to improve things ( seemed a good idea...