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.

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

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,

For one moment I thought you were peering out through the kitchen
window and saw 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) ?

Possible. Worth checking the vent is fitted correctly before going any
further. Also check the fga A ports in the flue are sealed.

There's also something in the back of my mind saying "gas regulation".
Perhaps the gas control module/valve is faulty or has dirty contacts
and causing a fluctuating flow of gas to the burner?

I doubt it's due to dirty jets as the boiler was serviced only a year
ago.

sponix

On Fri, 24 Feb 2006 10:22:31 +0000, Owain
wrote:

Ian Middleton wrote:
His "man" sorted it and iit no monger thumps,

Oh good, must be terrible having a thumping monger.

My m8 got thumped by a monger once.

sponix