Boiler leaking slowly cold water

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7 Nov 2015
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United Kingdom
Hi, I have a biasi m90e24s boiler. 4 weeks ago it started a slow cold leak. I realised because the system was empty. I went... filled up the system... bled the radiators... and then when I returned to the boiler I saw the leak. I then gave it another blast thinking I'm going to have to fill this up until I can get a plumber, and the leak stopped. Now all of a sudden, the leak has returned. Really not got a clue about what's going on. Can anyone help?
 
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Where is it leaking from?
It's leaking from the bottom. From the pipe that returns the central heating. Is there a valve right there? Is there a chance that the valve occasionally get's stuck and hence causes water to leak out?
 
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So if the leak is on the return of the CH, It should not be cold!
I would expect it to warm/hot when the central heating is on.
There will be a valve and some nut connections. It could be possible that a nut needs nipping up or a washer needs replacing, if as you say it is at this location. But don't rule out the leak being elsewhere and water is tracking to that point.
 

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