Fuse keeps blowing?

I have just installed a Triton T80 XR shower & have just carried out commissioning the unit but,every time i turn the setting to economy & increase the heat on the dial the 3amp fuse in the isolator rocker switch keeps blowing? Do i need to increase the fuse rating! or is there something else wrong?
Steve, December 2005
I am surprsied that a shower unit has a 3 amp fuse BUT as you do not appear surprised I suggest that you get a qualified electrician to look at this. (You can't just increase fuze sizes willy nilly.) Finally if you are in the UK, since the end of 2004, you are required by law to have that kind of installation installed or inspected by a "competent person".

Terry, December 2005
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