Why does my Aqualisa shower keep blowing fuses?

My aqualisa shower keeps blowing fuses, every few days on average. We recently moved house and the shower was fine for around a month, but then the fuse went. No big deal, just replace the fuse but since then it blows every five or six uses.
Any advice would be most appreciated as to change the fuse involves a trip to the attic which is starting to become painful at 6.00 in the morning when trying to get ready for work..!

Graham Probert
June 2007