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Chris, The noise is a sort of metallic grinding noise, a bit like the sound of pulling a very heavy iron lawn roller across gravel, and loud enough that the first time we heard it we thought it was an earthquake (till we remembered we were in England). It lasts about 5 seconds, and repeats...

Recently bought house 6 years old, with a Vokera Mynute 28SE gas boiler with rads with individual thermostats. Unless we have at least one radiator on full setting, there is a deafening noise (from the boiler itself, I think) soon after the heating comes on. (Not a problem with hot water only)...