how to fix my indesit di620 dishwasher?

is anyone able to help me please? my indesit di 620 dishwasher is playing up, when i try and put it on any of the cycles between 1-4 it starts the cycle ok then very shortly after it stops and starts beeping then the 2&3 lights flash together and it does nothing. not sure if its a problem with the circuit board internally. if anybody can shed any light then i would be really grateful.

marty mac
January 2011