cold water inlet leak
If it is just the connection perhaps you could take it apart and remake the joint, however if it is any of the internal components none of these are serviceable therefore you will need a new engine.
http://www.showerdoc.com/gainsborough-9-5kw-replacement-shower-engine-482802
Answered 11 years ago by The Shower Doctor
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Gainsborough 9.5 E Shower Spares
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