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noisy baxi boiler help !


 
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sie1uk

from United Kingdom

Joined: 21 Nov 2005
Posts: 160
Location: Sheffield,
United Kingdom

PostPosted: Mon Nov 21, 2005 8:22 pm Reply with quote

please can anybody help, i know that there are many threads on here for noisy boilers but non seem to be the same as mine.

my boiler is a baxi XXXXXX and is quite old, ok very old

when the system is running either hot water or heating its fine, the problem comes when it shuts off there is a lot of banging and whooshing and gluging sound coming from what i think is the overflow return pipe, if i touch the pipe i can feel the clunking through it, it sounds like there is boiling water trying to escape through it however there is nothing coming out of it, the banging last for about 10 minutes after the boiler has gone off.

iv checked the large and smal tanks in the loft and they are both full of water well over the outlet pipes, iv bled the pump and the rads to no effect, im wondering if some kind of cleanser would help, but not sure which to use or if it will make any diffrence, any help would be much appreciated, cheers simon

++++++++++++++++++++++++

sorry i meant to say its a baxi wm 55/3
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ChrisR

from United Kingdom

Joined: 24 Jul 2003
Posts: 23353
Location: London,
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PostPosted: Sat Dec 24, 2005 8:54 pm Reply with quote

Try Fernox Heavy Duty Restorer for a week, then do some flushing - see reference section.
Probably also another circulation problem - do a search on "sludge", "blocked feed pipe".
Presumably it's less of a racket if you turn the boiler stat down?

First thing I'd do, AFTER trying it with the boiler stat turned down, would be to put an aquavac on the vent pipe (over the feed cistern in the loft). Amazing what comes up!


Last edited by ChrisR on Sun Dec 25, 2005 2:13 am, edited 1 time in total
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HarrogateGas

from United Kingdom

Joined: 14 Dec 2005
Posts: 944
Location: Yorkshire,
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PostPosted: Sun Dec 25, 2005 12:38 am Reply with quote

Id suspect your boiler stat is faulty and is not shutting down till its far too hot. When you turn off your heating or hot water the pump stops and the latent heat in the heat exchanger is boiling the water.
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Agile

from United Kingdom

Joined: 26 Jun 2004
Posts: 52973
Location: London,
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PostPosted: Sun Dec 25, 2005 1:13 pm Reply with quote

The original question was posted 35 days ago!

One hopes they got it fixed some time ago!

Happy Christmas everyone!

Tony Glazier
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chrishutt

from St. Pierre and Miquelon

Joined: 20 May 2005
Posts: 5344
Location: St. Pierre and Miquelon
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PostPosted: Sun Dec 25, 2005 4:56 pm Reply with quote

Quote:
The original question was posted 35 days ago!

But what you won't know Tony, seeing as you've been so busy opening your record number of xmas presents, is that the OP has bumped the question back up several times, including yesterday, although the Mod seems to have removed these bumps now.
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sie1uk

from United Kingdom

Joined: 21 Nov 2005
Posts: 160
Location: Sheffield,
United Kingdom

PostPosted: Tue Jan 03, 2006 7:57 pm Reply with quote

no i havent had it mended yet, iv just put up with the noise over xmas, ive found that there is hot water and steam coming from the overflow pipe, this happens when the boiler has just switched off for approx 5 mins, only a small amount of water but plenty of steam and burbling sounds. any one got any further ideas. cheers simon
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bab

from United Kingdom

Joined: 31 Dec 2005
Posts: 863
Location: Lancashire,
United Kingdom
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PostPosted: Tue Jan 03, 2006 11:04 pm Reply with quote

Boiler stat does sound worn try running on min & see hoe hot the rads get. the last time i saw a similar thing the cold feed was blocked & when the pump shut off cold water from the vent came into the boiler & it didnt like it changed to steam. Does this happen evertime the boiler shuts down on its thermo stat or only when the clock or room stat turns it off.
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sie1uk

from United Kingdom

Joined: 21 Nov 2005
Posts: 160
Location: Sheffield,
United Kingdom

PostPosted: Sun Jan 08, 2006 10:20 am Reply with quote

sorted it was a blocked air seperator valve which eventually fractured and leaked all down my freshly plastered walls downstairs ! live and learn !
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