I had a new radiator fitted in kitchen, But now my down stairs radiators do not work (They are not even getting warm) Plumber said the pump is not strong enough and this would need to be changed BUT the radiators worked before he changed kitchen radiator. Any other idea what it could be apart from buying a new pump ?

Hmmm, that is an odd answer from the plumber??

Have the radiators downstairs been bled of all air? If not, I suggest you bleed a few cups of water/air out of each radiator and see if that improves the issue. if not post back and we'll see if we can think of anything else.

Mark