How can I defrag/fix my Westinghouse 920 dishwasher?

DW not responding to 'wash select' when that button pressed - power/power on OK but then DW goes into
some odd mode with each of the 'pre-wash'
'fast' 'norm' and 'heavy' lights flashing green (one at a time in that order and in a continuous cycle) ?
Any help/comments/leads appreciated.
Ian Singline, April 2013


link Click here to see other fixes for Westinghouse.