On Sun, 16 Jan 2005 00:59:05 -0800, tc7 wrote:

Just done a quick test. If the upstairs tap is turned on for 20
seconds, ten seconds later the boiler (downstairs) makes a huge
vibrating noise and all flames go out (including the pilot).


The boiler is over heating. There could be a number of reasons for this
but the vibration sounds like localized boiler due to lack of flow.

The O/H stat kills the thermocouple.


So:
Does the pump stop?
May the O/H stat is at fault (but that won't explain the vibrations).
Controller problems?



--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at www.diyfaq.org.uk
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