Sorted: Boiler making strange noise

[Surefire]

Hi All

Recently my otherwise reliable Potterton Prima F boiler has started to make a buzzing noise. Sometimes but not always, When the boiler switches off (as told to by the room stat) a loud buzzing can be heard thoughout the house and the radiators are vibrating along with the buzz. It seems like a valve somewhere is oscillating. If I power down the boiler and power up again the noise stops. I dont think its the diverter valve as the noise seems to be coming from the boiler itself. Is there a valve in the boiler that could be responsible?

Thanks

 

[Surefire]

For anyone who's interested, I traced the problem to a TRV on a new rad that I fitted recently. Just gave it a fiddle and the buzzing stopped. If only everything was that simple eh?