"Andy Hall" wrote in message
...
On 15 Mar 2004 11:33:21 -0800,
(SledgehammerSteve) wrote:

Thank you very much for that advice Andy.
I will get in touch with Transco asap.
Thanks again
Steve

(I now fully appreciate theres a lot more to fixing boilers than
replacing
the thermocouple)

You're welcome.

It's not particularly high-tech with boilers like this, but not
necessarily obvious either.


If this is a "new" problem there is a chance that the gas valve has an inlet
filter choked with fine dirt from the pipework. The burner opens up the main
gas section which causes a significant pressure loss across the choked
filter and limits the amount of gas passing to both main and pilot flames
thus the reduced pilot flame is no longer enveloping the thermocouple
sufficiently and it cools down then releases the gas valve.
Unfortunately the OP doesn't sound sufficiently "competent" to fix the
problem and should get a pro in