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Norm4n



Member Since: 31 Aug 2012
Location: Surrey
Posts: 329

United Kingdom 
Any plumbers - why is this boiler leaking?
My boiler has a weep from this small pipe on the top LHS.

Any idea what it is and why it may be leaking, looks like an overflow for something



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Post #262604 31st Aug 2013 11:47am
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landy andy



Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5980

2006 Defender 110 Td5 USW Zermatt Silver
I think that is the vent tube from the top of the auto air bleed inside the case. The auto air bleeds fail after time, becoming lazy. So I would shut auto bleed off, or replace it if leaking a lot. As on a good system they are not really needed once system is full.

Is it leaking a lot?

Andy
Post #262606 31st Aug 2013 11:59am
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Norm4n



Member Since: 31 Aug 2012
Location: Surrey
Posts: 329

United Kingdom 
Once or twice a week it's a slow drip, other days nothing.

How do you shut it off?

Thanks for the advice
Post #262609 31st Aug 2013 12:38pm
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steve E



Member Since: 06 Mar 2011
Location: Tenby
Posts: 2076

Wales 
Have you checked the water pressure
If it goes too high the over flow will kick in.
If the water pressure has risen, check the recommended level
For that particular boiler and either open the mains water tap to increase water pressure
Or bleed a radiator to decrease it. If it is within the normal pressure it shouldn't leak.
Post #262618 31st Aug 2013 1:55pm
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Norm4n



Member Since: 31 Aug 2012
Location: Surrey
Posts: 329

United Kingdom 
Water pressure was low when it was leaking. 0.5bar.
Post #262636 31st Aug 2013 4:17pm
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skyeplumb



Member Since: 22 Apr 2013
Location: Isle of Skye
Posts: 134

Scotland 2007 Defender 110 Puma 2.4 USW Rimini Red
I'm not familiar with your particular boiler, but I've just had a look at the service book for it and it appears to be an automatic air vent thats leaking - these AAV's frequently fail - they are a float that operates a pin in a tube, so when air is present the float drops and lets the air out, the water rises as does the float, pushing the pin in and sealing the device. The problem is that central heating water is usually full of Cr*p and this can stop the pin seating properly - and / or the rubber seal in the vent can deteriorate.
Hope this helps. Series IIa Lightweight - Long Gone
Discovery 1 300Tdi - Sold
Defender 110 XS 07MY Utility
Post #262640 31st Aug 2013 4:42pm
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skyeplumb



Member Since: 22 Apr 2013
Location: Isle of Skye
Posts: 134

Scotland 2007 Defender 110 Puma 2.4 USW Rimini Red
in addition to my above post - here is the service book -

https://www.heatingspares247.com/download/...ctions.pdf

for information only - get a Gas Safe registered engineer to repair it
shouldn't cost much if it's only the AAV that needs replaced. Series IIa Lightweight - Long Gone
Discovery 1 300Tdi - Sold
Defender 110 XS 07MY Utility
Post #262643 31st Aug 2013 4:51pm
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Norm4n



Member Since: 31 Aug 2012
Location: Surrey
Posts: 329

United Kingdom 
Brilliant thanks
Post #262671 31st Aug 2013 6:25pm
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