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how can I fix my mira supreme 8.4 electric shower?

There is water dripping from the bottom of the shower casing.
Gordon, August 2010
It sounds as if the pressure switch needs replacing. The part is obsolete and may be difficult to source. Might be a good time to replace with a new Mira Advance

Bert The Plumber, August 2010
link Click here to see other fixes for Mira.