Vaillant ecotech 937 noise

Joined
5 Feb 2013
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United Kingdom
Hello all,

My boiler has developed a funny noise that can only be described as like when you finish a drink through a straw and suck up the last bit from the bottom.. that noise?
The noise is coming from underneath the boiler and inky does this when the hit water is on and seems to make the noise note so once the hot water tap is then turned back off again... I have yet to test is it does it with the central heating on
I have put a video on youtube if anyone could have a listen and kindly offer advice on what this noise may be?

Many thanks in advance.
 
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