Hi

I have a flu component in my combi boiler which I need to clean very
thoroughly. It is called a "flue elbow" by the manufacturers and this is
quite a good description I think. In this flue elbow are a couple of little
tubes which are part of the pressure sensor mechanism. The flue elbow looks a
bit like a part of an extremely large carburettor.

The problem is that this flue elbow seems to get coked up every couple of
years and this interferes with the pressure sensor. The small tubes for the
pressure sensor probably get coked up I guess. I can get a pipe cleaner down
them but I don't know of any solution that could be used to assist with
cleaning of them.

The main flu elbow itself is an aluminium casting. The smaller tubes within
it are definitely metal but it is hard to know which one, they aren't
aluminium, they could be copper, but they seem to hard for copper to me.

I'd like to know if there is a solution of some sort that could be applied to
this component to bring it up shining like new?

TIA


--
Patrick