A weak link in things like dishwashers is the water heating element - and it's a likely, most-probable-cause.
The literal answer to your question, "how can I fix?" is to diagnose and repair. Ask yourself questions like...
At what point in the washing cycle does the fault happen?
Does the fault happen on all washing programmes?
What can I eliminate quickly and easily?
Does the "trip" take out just a power circuit or the whole house?
Your other options apart from self repair are to call in an engineer, or to replace the machine. - A warranty claim, if you are able, is preferable.
In the UK Comet are quite good - if you order before 1pm and they have it in stock (at their depot) they will deliver next day.
Peccavi, May 2009
