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Thanks Jeff, I'm not sure if that's something I can check without opening the boiler? Not very confident at doing that. I'm in a soft-water area if that's any help? I should have mentioned that there is a magnaclean filter on the boiler which I have also cleaned.

Thank you Razor900. I put the cleaner in on Monday night and have been running the system ever since, but with no noticeable difference in temperature. I think it's reaching the stage where I need to admit defeat and call someone in, but just wanted to see if anyone here had any other...

Hi My central heating has been getting progressivly colder for the past few years. I've taken each radiator off and cleaned a lot of black sludge out of them, which has improved things slightly. I've also cleaned the magnetic filter on the boiler. However I'm concerned that there may also be...