Hi.
I too have the same problem with the same model dishwasher...and apparently so have a lot of other people.
Check out :
http://www.myshopping.com.au/RV--992_Dishlex_DX302SJ_Dishwasher
It seems to be a simple soldering solution on the control panel to fix the problem which can be done by yourself or by a repairman at a cost of around $300+
One common feeling from all the comments is that they won't be buying a Dishlex ever again.
I'm going to tackle my dishwasher this weekend...wish me luck!!
Hope this helps.
Cheers.
Tim the Toolman, October 2010