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(Andrew Gabriel) wrote:

In article ,
Richard writes:
Thanks for your advice
Man acme today, fitted new fuse and after 30 mins spooted micro leak
in seal where flue attached to boiler. This is the black rubber
gasket. It seems it is sealed by just silicon from a gun. If it lets

I can't picture a black gasket in the flue path.
Was this the burner gasket -- the large rectangular
gasket on top of the rectangular heat exchanger box?
A leak at this point would be very hot, whereas a
leak in the flue would be much less so.

I did replace the burner gasket on mine during servicing as
a) it was impossible to get it off in less than about
10 pieces because it had been glued on, and
b) it had hairline cracks through at several of the
mounting holes (although I couldn't actually see any
sign of leaking there).
I didn't silicone in the replacement gasket as the instructions
don't say this is necessary. I did check it again a week later
to make sure it still looked OK with no sign of leaks/cracks.
I bought a couple of them -- can't remember the price but
it was under a tenner each.

my teminology is not really accurate. it is a black ribbed tube going
up to the flue outlet. The base of the tube should be sealed with
silicone otherwise flue gasses/water can leak into the cabinet. The
flue gasses are i guess not hot enuf to trip the overheat but the
water can be turned to steam by the hot surfaces and im told fill the
cabinet with steam and this would clearly trigger the overheat.