when hot water or heating starts on the boiler sounds like a plane is taking off the stops after around 3-5 minutes.changed diverter & auto bypass.also changed the pump? any help please?

pat g, September 2008

Hi
Have the same problem on mine, boiler fires up at 6.30 in the morning then 7 mins later the noise starts.
suspected at first the fan flue (see previous reply).
however as the noise always starts 7 mins after boiler firing i can only assume its something to do with trhe modulation of the burner flame. hope this helps.

Simon Mills, November 2008

similar problem on mine and i suspect its the flue fan

simon mills, October 2008