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petit_pablo, Fair point - I guess the pipes could very easily be cooler than they appear to me. Time to get a thermometer then. Matt.

All, Obviously I'm a heating numpty with no training/expert knowledge, but I'm struggling to understand why the radiators are getting so hot (and the pump/pipes etc) if it's all caused by sludge. Is it just because the 'system' isn't allowing the proper flow of water due to restrictions...

nogoodatfaultfinding, Thanks for the advice - that is something the heating engineer did suggest, but we didn't have a magnet when he came. So you're suggesting that if I find a blockage, it's unlikely to be shifted with a flush (power or chemical), and instead I should get the pipes...

Tony, So this acid based chemical flusher would basically eat away at the copper/steel in the system as well as the sludge, which could give me more problems? If I can never properly 'clean' the system, will I continue to get problems, and will I have to look at getting the whole heating...

petit_pablo, Thanks again for the advice. Draining down the system sounds a bit out of my league - so getting a pro in would save me getting in trouble with the Mrs when I flood the lounge with black sludge. Where is the heating manifold - in the boiler itself? Matt.

Tony, So a sludge build up is causing the problem? Does that mean the pipes/system are blocked, resulting in restricted flow, hence the hot water that cannot be circulated returns to the F+E tank rather than flowing round the system? The heating engineer who came did say that a flush might...

petit_pablo, How would I go about diagnosing that as a fault? How can I check the pipes for blockages - or is it just a case of flushing the systems out? Matt.

Hi all, I'm new to the forum, and am a complete plumbing novice. I've been reading the forum for about a month trying to find out what's wrong with my heating - but so far I haven't been able to identify a solution to my problem. The system is relatively new (about 10 years) with...