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Thanks martyndc88. Both of the Worcester service engineers said that the pump was a modulating pump and that it's speed could not be manually altered.

Hi. The boiler is mounted on a brick and block wall. Both of the Worcester service engineers reckoned that it was the pump. The first engineer even changed the pump but it made no difference. My only course of action now is to put some noise insulation in the cupboard. There are many products...

It is a CDi Compact

Thanks muggles. This is the sort of information that I am looking for. Much appreciated.

I had a Worcester 36CDi boiler fitted last year and when the heating is on and has reached a 'steady state' condition there is an annoying constant whine. 2 Worcester service engineers have been out to look at it and they say it is the pump running and there is no problem. I have contacted...