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Discuss Vaillant ecotec 937 noise in the USA area at PlumbersForums.net

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Hello all,
My 1st post, here goes

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 only does this when the hot water tap is on and seems to make the noise for a minute after the hot water tap is shut back off again... I have yet to test if 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?

View: https://youtu.be/8g4lqK5N7U0
 
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