wash neon flashing is water fill time has elapsed but it has been washing for 10 mins could it be syphoning itself out so that the level drops
or with it being an electronic board try on insulation brakedown on a component i have found the rinse aid sensor to be poor and P C B to do funny things
alro
how many times does the light flash as it will indicate fault sounds like heater open circuit or module blown on heater relay very common on zanussi.if u take board out of case you will soon know it will be blackened inside case