central heating pump failure

[Shelly]

My central heating pump has been replaced 3 times in just a few months. What is causing it to fail? (It becomes very, very noisy) . The engineer just replaces the pump and doesn't seem interested in finding the root of the problem.

[MJPearson]

I guess that it depends on how your central heating system is designed, but when I had my system installed a few years ago, I seem to remember the engineer saying something about making sure at least one radiator was "on" when the pump was running. It could be worth checking that - additionally, if you have thermostatic valves on radiator should have a valve that is always on. Failing that, it could be a blockage - I'm not a plumber, but I believe that you can put chemicals in it to prevent scale build up / corrosion etc. Hope this helps!

[kafatwork]

Your system is really, really, really bunged up. mine has been changed twice in the last year and when the pump is removed there was a black thick sludge came out. The pump starts off being noisy, and then then starts to create air locks as it is labouring to get the slugde and water around the system. The only real cure is to pressure jet the system or if you have an old boiler, replace the entire system. Or so british Gas told me??.

[ruche rouge]

Faulty installation. Design flaw in system. I am a heating engineer with over thirty four years experiance (ex north eastern gas)