Squealing noise from boiler/radiator pipes

[Martynf]

Can anyone help please? When I turn my boiler on at anytime of the day it makes quite a loud squealing noise, it seems to be loudest close to the boiler, this happens when the boiler fires up and it doesn't seem to do it for the hot water.

I have been told I might need to get a product from a shop that will reduce the noise by pouring it into the small tank in my loft and draining some water from a rad to get it round the system, is it as simple as that or should I try something else? I have one rad that needs bleeding every so often, do I need to try and bleed them all?

Thanks in advance

 

[bengasman]

Uh oh, open vent? Needs regular bleeding? Sounds like the pump is dying

 

[Martynf]

The pump is brand new but thanks anyway.

I sorted the problem, the boiler had been turned up (somehow) to number 5 (Very very hot) so I turned it down to between 3 and 4 and it is fine now.