Boiler noise with link to sound

[Uzible]

Hi,

We've been having this noise on our Valliant combi boiler for a while, 1/2 years+ (link below). Unsure what it might be, perhaps nothing to worry about. Does anyone know what it might be and if it's anything to be concerned about?

Link: SndUp | Post info - http://sndup.net/dj3t

I've tried calling someone out but they haven't been able to identify because the sound isn't all the time.

• It doesn't always happen, maybe once a day or more. 2 judder noises with a 15 second pause then continues.
• When it does happen the boiler is not in use, so it's very noticeable because it's quiet.
• There might be a pattern that it happens usually after we've had a shower/bath.

Would appreciate your help.

 

[Deleted member 120897]

It might be the washer on the stopcock, or could be water hammer, especially as it happens when the boiler is off. It doesn’t sound boiler related.

 

[Uzible]

It might be the washer on the stopcock, or could be water hammer, especially as it happens when the boiler is off. It doesn’t sound boiler related.

Thanks