Hi, I de-sludged my system a couple of years ago by draining entire system, after completing project one radiator downstairs remained cold. Lived with this, but yesterday i flushed and de-sludged system again, after refilling 2 radiators remained cold (both downstairs). Drained and refilled again today to see what happened and am now up to 3 useless radiators (all downstairs) thats all my downstairs heating gone. any ideas?
You won't desludge by just draining. Even adding X400 for a a while then draining again won't shift it all. If you have a sludge problem you can either add X400, wait, drain, remove each rad in turn take it outside and mains flush it through with a hose pipe or just powerflush the system.
However, I think your immediate problem isn't sludge its air. You haven't cleared all the air out of the system on refilling.
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