when turned on, the shower does'nt work at all I suspect the
solonoid valve as the water supply is o.k. as far as the solonoid are these still available please
if this is an old dolphin with the mirror front and perspex block heater(1970s/1980;s) then contact an electrician
have you tried contacting dolphin to see if they can still supply the part. the more recent dolphin electric showers are badgeds and made by the major brands