Bee Noise from Boiler

[Bubbauk]

Hi All

In the video below you can hear a noise that sounds like there is a bee in my boiler, it is very odd noise and is very intermittent(once or twice a week).

I have had someone out to look at the boiler and typically it was not making the noise, he inspected and serviced the boiler and could not find the cause of the issue.

I have sent them this video as well and they said they have never heard this noise before.

Can anyone provide any help with this? Boiler is a Vaillant ecoTEC pro 28.

Thank you
David

 

[durhamplumber]

sounds like there is a bee in my boiler, it is very odd noise and is very intermittent

Half dead Bee?..Buzzing noises are usually relays/solenoids.Might have to wait until it becomes a more permanent buzz to find it.