Dave writes
I've recently refitted a Mira Event Power Shower after retiling the
shower cubicle. I've also fitted a new shower head and hose of a metal
type. The one originally supplied with the shower was plastic.
Everything seemed to be fine for a week after the shower was put back
into action but now there is a slight electrical shock when standing
in the shower and touching the shower hose, and only when the shower
pump is running.
Sounds familiar.
Check the voltage between E and N at the terminals where the mains comes
into the unit.
If it isn't between a small fraction of a volt and 3 volts, the earth
lead to the shower is broken/not connected somewhere.

--
roger

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