"Graham Jones" wrote in message
...
snipped

Today I tried to find the source of the leak, I stripped the boiler down
as
far as I dared. It seems to be coming down the righthand side of the
inside
of the air box, between the air box and the combustion box.

So I reckon it is either from the flow or return into the heat exchanger
or
something to do with condensate from the flue at the top. The condensate
trap seems to be filling and emptying correctly and is clear of debris.

The next stage I reckon would be to remove the heat exchanger assembly,
but
for this I would need to drain down. The wife wants to call someone in, I
am
near to agreeing with her.

One question, as the water in the system is under pressure then wouldn't
the
leak drip all the time rather than just when the boiler is operating? If
so
then it must be condensate, mustn't it?

Graham

Or rain running along the inside of the outer pipe on the flue. Is there
any water mark along the inside bottom of the pipe? Or any water marking at
all along the flue pipes? If it's condensate, you should see where it has
been dripping or running along the metal, as it leaves a bit of a mess
behind because of what contains.