sympton of heat exchanger clogging up

Hi there, you may hear some funny noises coming from hour boiler while in heating mode and you'll probey notice that your raidators aren't as hot as they use to be, in most cases you can solve this with a 'powerflush' which will pump a chemical through the whole central heating system and remove the scale. Hope this helps, Please feel free to get in contact if you need any other advice

It would be wise not to wait until your heat exchanger clogs up when you can prevent it. Modern water treatment chemicals (Fernox, Sentinel, e.g.) will prevent scaling, rusting and clogging and either shop assistant in plumbing supplies or a heating engineer will advise you on what's suitable for your system. Regular exchange of the charge (5-7 years) will ensure trouble-free performance and substantially prolong service life of both the boiler and the radiators as well as all the other components of the system.