On Thu, 23 Feb 2006 16:34:50 +0000, Ian_m wrote:

Was at a friends house at the weekend and noticed that their boiler in the
kicthen was "thumping" slightly.

Peering through the window, nice blue flames, but sometimes "wavering/moving
up" causing the slight thump as the flames jump back to the burners. Issue
may have been worse on flames out of sight of inspection glass. Boiler was
fitted 2002 odd.

They did have an issue about a year ago, where after having it serviced the
outdoor vent fell off, but the servicing guy returned to sort that.

My thoughts were exhaust fumes getting into the air intake (especially as
they mentioned issue with outdoor vent) or air leak in the side of the
cabinet allowing air to be drawin in or heat exchanger dripping water
(though nothing leaked yet) ?

If he can fix it themself he would like to, though I did suggest he look at
the vent again to see if fallen off/broken.

This is not right.
If you could describe the 'outdoor vent' that would help.
Make and model would be a bit helpful too.




--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html