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I don't think it has a condensate drain as it's not a condensing boiler. It isn't under guarantee as it is just over 3 years old. I have just spoken to the installer and he also thinks the problem could be with the flow restrictor in the cold inlet. Thanks for your help.

Thanks for your quick reply Tony. In answer to your question about when and where the noise occurs, it seems to be coming from the hot water flow inside the boiler and occurs more or less constantly when the central heating is off and there are no taps calling for hot water. I have also...

Hello all, I have a Worcester 28SiII which has started making a loud whistling noise. The boiler is 3 years old. I first noticed the noise after the timer had just turned the heating off. I turned on a hot tap and the boiler lit and the noise stopped but as soon as I turned the hot tap off...