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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
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