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Boiler/heating Megathread Pt 2 - boiler & heating queries, no quotes

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25-02-2008, 10:32   #1
The otter
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My boiler drops in pressure after every time it is in use.

I'm constantly having to top it up and i've noticed that water is coming out of the pipe to the exterior of my house.

Any ideas what the problem might be and how much it could be to fix.


Any help appreciated


Thanks
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25-02-2008, 10:48   #2
neeeeeeeeeek
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I had that, some valve or diaphram needed replacing. It was not that expensive but you need a Corgi registered plumber.
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25-02-2008, 10:55   #3
rad
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There may be a leak in the systemm - I'm having that problem right now.
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25-02-2008, 11:07   #4
neeeeeeeeeek
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It won't be a leak if it's coming out the pipe at the back as that's where it's supposed to come out.
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25-02-2008, 13:46   #5
Complete-Heat
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Maybe the filling loop is bypassing. Easy way to check is to fill the system to 1.5 bar and then disconnect it. If you not happy to do this then fill to 1.5 bar but DONT use either hot water or heating for 6-12 hours. If you see the pressure valve rising then filling loop is the culprit.

HOWEVER, more than likely the expansion vessel has either lost pressure or the expansion pipe is blocked. This causes the pressure to rise (when the heating is on) to above 2.5bar and the safety PRV kicks in - hence noticing water outside. You will also need the PRV replacing
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25-02-2008, 13:48   #6
Complete-Heat
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Quote:
Originally Posted by neeeeeeeeeek View Post
It won't be a leak if it's coming out the pipe at the back as that's where it's supposed to come out.
That pipe should always be dry unless the boiler has a problem. Its linked to the safety pressure release valve.
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25-02-2008, 14:07   #7
neeeeeeeeeek
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Sorry, I was not very clear. I did not mean all the time, just when there is something wrong! it's what happended to mine.
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25-02-2008, 14:49   #8
The otter
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Quote:
Originally Posted by Complete-Heat View Post
Maybe the filling loop is bypassing. Easy way to check is to fill the system to 1.5 bar and then disconnect it. If you not happy to do this then fill to 1.5 bar but DONT use either hot water or heating for 6-12 hours. If you see the pressure valve rising then filling loop is the culprit.

HOWEVER, more than likely the expansion vessel has either lost pressure or the expansion pipe is blocked. This causes the pressure to rise (when the heating is on) to above 2.5bar and the safety PRV kicks in - hence noticing water outside. You will also need the PRV replacing




This sounds like the problem. How much is that to be fixed approximately
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25-02-2008, 17:57   #9
Complete-Heat
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Quote:
Originally Posted by The otter View Post
[/U][/B]

This sounds like the problem. How much is that to be fixed approximately
Need to know make and model of the boiler first.

On some boilers you cant get to the expansion vessel (unless you remove the boiler from the wall). Therefore you 'tie' a new vessel into the existing system. Also gotta drain down. Again some boilers have quality isolation valves on the flow/return AND a drain off internally which makes for a quicker job. Unfortunatley most do not

You also need a new 3bar PRV fitting as the old one will continue to leak.
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26-02-2008, 01:25   #10
pegmosaic
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mine did that, I had a leak under a tiles floor!! :-(
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26-02-2008, 19:41   #11
Complete-Heat
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Quote:
Originally Posted by pegmosaic View Post
mine did that, I had a leak under a tiles floor!! :-(
A leak outside of the boiler, ie in any of the pipes below/above the boiler, will NOT make the pressure release valve (PRV) discharge.

Gauge rises from its normal 1bar to 2.5bar (at which point the safety valve kicks in) mainly due to:

faulty filling loop
expansion vessel needs repressurising
the DHW heat exchanger is leaking so cold main water passes over to the heating side

Last edited by Complete-Heat; 26-02-2008 at 19:43.
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26-02-2008, 20:40   #12
The otter
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The boiler is a saunier duval but i'm not sure of the model
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26-02-2008, 21:33   #13
nissan
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Its allways nice to watch without commenting, you at compliheat know your trade switched on to the modern repair of boilers and for the record I have been a gasman for 40 years, and still batting with problems which come every day and you seem to have a good comprehension of the job I will put money on the boiler loosing pressure daily being the p vessel VAILLANT RULES OK
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26-02-2008, 22:33   #14
Complete-Heat
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Quote:
Originally Posted by nissan View Post
I will put money on the boiler loosing pressure daily being the p vessel VAILLANT RULES OK
You know how much i like Vaillants. Cracking boilers.

Like you nissan, i still get thrown. You never know what you're going to come across .

I suspect the expansion vessel... however, OP has mentioned that its a S.Duval . I'm sorry but those bl**dy french boilers leak from every orrifice and at every opportunity
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27-02-2008, 01:40   #15
webbud2
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maybe the release valve has been left in the open position all you need to do is link the pipe that goes out side and look to see if it has a washing machine looking isolating valve on mostly black plastic lever and close it when it is closed the lever shoud be 90* to the valve
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01-11-2012, 16:52   #16
donetello
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Hi
Anyone have an boiler installation done by the above,or know anyone that has.Looking for an install of a new Vaillant 831 plus combi boiler,to upstairs hot water tank cupboard,and to replace 8 radiators and TRVs and replace gas fire with electric one after removal of old back boiler etc.Have had a decent quote from the above.Just looking for feedback/reviews on them.Thanks.
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16-11-2012, 08:59   #17
ricm
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I'm finding it really hard to find a fully-accredited Viessmann engineer to service a boiler. Has anyone else had the same problem? Who did you eventually manage to find?
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16-11-2012, 15:40   #18
UglyBob23
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Had to look up what you were on about and found this:

Find a Local Installer

Looks to be a couple of installer in Rotherham; hopefully then would do a service too.
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16-11-2012, 16:44   #19
corgigasman
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Try 'Mr.Peacock' on here, he is a Viessmann specialist
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16-11-2012, 19:20   #20
ricm
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Thank you both.

UglyBob: In fact the link to installers proved to be quite prolific in coming up with a number of contacts. I've e-mailed most and now awaiting replies.

Corgigas: I shall look up 'Mr.Peacock' and see if he is interested.

Regards all,
Ric
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