Knocking noise when HW tap is turned on

thesmoothound · 7 Mar 2011

Hi,
When the HW tap is turned on downstairs or upstairs and when the HW comes through, there is a knocking noise. This has only started about a month ago. What could this be?
Thank you

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Knocking noise when HW tap is turned on

thesmoothound

DIYnot Local

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