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pressure keeps dropping in combi boiler


 
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teddyb

from United Kingdom

Joined: 26 Nov 2006
Posts: 146
Location: Somerset,
United Kingdom

PostPosted: Sun Aug 26, 2012 3:30 pm Reply with quote

Hi there

The pressure on our combi boiler keeps dropping. We re-pressurise in the normal way but it falls again quite quickly. The central heating is not being used at the moment. There are gurgling noises in the boiler when hot water taps are used - and this is when the pressure drops most noticeably - suggesting a connection there! Is this URGENT - it's Bank Holiday tomorrow!

Any advice will be appreciated, thanks, as always.

Boiler is a Grant Vortex Combi, fitted only 3-4 years ago and serviced annually.
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dcawkwell

from United Kingdom

Joined: 02 Nov 2010
Posts: 3345
Location: Humberside,
United Kingdom
Thanked: 505 times

PostPosted: Sun Aug 26, 2012 3:41 pm Reply with quote

Refill boiler to approx 1 bar cold. Light boiler.
Check for any leaks from the pressure relief pipe (one going out through
the wall. Any drips indicate a faulty pressure relief valve.
If the pressure climbs quickly once switched on to 3 bar your expansion
vessel in the boiler need pumping up or has failed.

Other possibility is you have a leak in your central heating pipework.

Worst case you have a leak inside the boiler.
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teddyb (26 Aug 2012)
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Boilerman2

from United Kingdom

Joined: 10 Jun 2009
Posts: 4966
Location: Suffolk,
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PostPosted: Sun Aug 26, 2012 3:42 pm Reply with quote

If you require an "Urgent" repair why not call the Service Comapny that have regualrly Serviced it?

cause of pressure loss may be a leaking AAV on top of the boiler, a flooded expansion vessel, or a leak somewhere on the system, (just because the central heating is not on dosen't mean there is not a leak on a radiator or pipe somewhere) icon_wink.gif
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teddyb (26 Aug 2012)
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awowen

from United Kingdom

Joined: 19 Aug 2008
Posts: 600
Location: Essex,
United Kingdom
Thanked: 98 times

PostPosted: Sun Aug 26, 2012 3:43 pm Reply with quote

Hi. How often are you repressurising?
Are there any obvious signs of a leak in boiler and/ or on your rads/ pipe work?
If not then check that your expansion vessel has not lost its charge. If it has then it will have to be repressurised and/or replaced.
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teddyb (26 Aug 2012)
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awowen

from United Kingdom

Joined: 19 Aug 2008
Posts: 600
Location: Essex,
United Kingdom
Thanked: 98 times

PostPosted: Sun Aug 26, 2012 3:44 pm Reply with quote

Sorry BM you must have clicked just before me!
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teddyb

from United Kingdom

Joined: 26 Nov 2006
Posts: 146
Location: Somerset,
United Kingdom

PostPosted: Sun Aug 26, 2012 3:50 pm Reply with quote

Thanks everyone! We shall definitely be calling the people who service it on Tuesday - if not before. I will go and check on radiators etc. There doesn't appear to be any wetness that I can see inside the boiler housing.

Cheers.
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