Noisy Vaillant Ecotech plus 831

[Bling]

I have an Ecotech plus which has been making a buzzing and vibrating sound intermittently for a few years. I have told the Vaillant engineer when they visit every year, but they can’t seem to locate the problem as the sound is never present when they visit.
I have recorded the sound as it is qetting louder and more frequent!

If anyone could identify the sound, I will try and upload it as the file extension is an issue

Many thanks

 

[Bling]

Hopefully this will play ok

 

[Hason]

Change divertor as bypass rattling very common need a gas safe engineer though, get a brass divertor as more robust then the plastic ones.
Hope this helps

 

[Bling]

Change divertor as bypass rattling very common need a gas safe engineer though, get a brass divertor as more robust then the plastic ones.
Hope this helps

Great, thank you. I have a contract with Vaillant to maintain and service the boiler, so will book an engineer.
I’ve just checked the water level and it seemed a bit low (forgot to check level prior to filling ) but it’s now at 1.8bars and 67 degrees and it has gone quiet again now so not sure if that was part of the issue too?

 

[AGAS]

Either take the advice or not as your the asking because you haven't a clue ,

 

[Bling]

Either take the advice or not as your the asking because you haven't a clue ,

?