If its a Mira shower then its probably just the filter is blocked. Switch off power and push up the shower circuit breaker at the house fusebox, no need to get zapped doing this. Take the front face off, and the filter is at the bottom left corner of the unit. You can unscrew it by hand (water will flow out once you remove it but the area is tiled, right?) and then remove whatever is blocking it. Then just reverse the instructions to fix it back up. The Mira tech manual says you need to call a plumber to do this but as long as you have a screwdriver in the house you don't...
wolfbag
July 2007