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We have had a Worcester boiler installed to replace our old boiler. Since it has been installed, there is a dreadful whistling sound coming from it when the heating comes on. The pitch changes depending on the amount of rads that are on. We have replaced the pump, thinking that was the...

I had the above boiler installed a few months ago. After a while, a high pitched noise seemed to be vibrating through the pipes. We thought that it was the central heating pump had become worn out and was straining. We have just had this replaced, and the noise is still there! The plumber...