boiler noise

[valleygas]

i have a baxi wall mounted system that works fine except when the temperature outside falls to below 4 degrees the boiler ' sings'..howling noise when the boiler is fired up.

I have gone right through the radiators bleeding them and they are all very hot top to bottom.

Please help the noise is unbearable in the kitchen on times!!!!!!

thx valley gas

 

[kevplumb]

i have a baxi wall mounted system

well that narrows it down to 50