High pitch noise from boiler flue

[Rajen]

Hi,
My boiler has started making a very high pitch noise when the heating turns on.
It seems to be originating from the boiler flue (see video https://bit.ly/3pYMFrI )
Is this an indication of air trapped in the system ? Do radiators need bleeding ?
Or a sign of faulty boiler part ?
Thanks

 

[ShaunCorbs]

Would say needs a gas engineer to have a look might just need servicing but might need two parts replacing

 

[Knappers]

Probably to do with the combustion and needs an engineer.
Unlikely to be dangerous but would get it looked at as soon as reasonably practicable (I hate that term).

 

[Scott_D]

As above, needs someone familiar with Ideal Logics to give it a full service - removing the burner and flushing it through. If that doesnt help will need a part or 2 to get it back to normal