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Worcester Bosch 42CDi Making Loud Noises?

When my boiler fires up it makes a loud "motorbike" type noise, which rattles the casing and vibrates throughout the house. This tends to last 5-10 seconds and doesn't seem to affect the heating and water.
We've checked the pressure and there are no error messages.
Anyone else had this problem?
Help!
Woodley, October 2013
link Click here to see other fixes for Worcester Bosch 42CDi.