On Nov 12, 2:17*pm, "ab" mum@mum wrote:
Our central heating radiators on the ground floor have one by one stopped
getting hot.
They have all been taken off the wall and been flushed out with water, but
this hasn't
made any difference. We have mircobore copper piping, we also have a combi
boiler.
The Radiators upstairs always get hot. The central heating system is about
30 years old.
The combi boiler is about 10/11 years old. Does anybody have any idea what
the problem is,
and how we can resolve it.

A flush is the last thing I would do, pumps wear, houses settle and
pipes can get airlock, does water come out with boiler off and water
hot. Is it zoned with zone valves and two pumps. Is it one feed for 2
floors, is there a balance valve off the boiler. Check for high areas
off boiler you could get air lock at. Here is a site with only boiler
pros, www.heatinghelp.com there you should be helped. What did the
several pros that came out tell you, over here nobody peddles the
flush that I know of. I would guess bad pump or air lock, since it was
gradual Id say pump, and its cheaper than a flush.