"Dave" wrote in message
...

Hi Can any one tell me why an Ideal Icos HE15 boiler that is 18 months
old,
would suddenly start making a loud and vibrating noise, when the boiler
fires up from a cold start. The noise and vibration last for about 20
seconds and then stops. Would appreciate any help Thanks.



Could be excess fuel at startup making one hell of a fire. Get it checked
out.