I have a Ariston LI62 Dish washer Your can alter the settings with the P button
The machine will pumpout then start filling then part way trips the RCD (I have read the other posts about water in bottom tray its dry no leaks) Pump out works, It starts filling and after a short time RCD trips (No water leaks) Now I have wrote this I am starting to think its the fill valve ?
Highly unlikely, most common causes are heater or main circulation motor down to earth.
You need to test these and all other components for insulation faults with a megger or suitable multimeter.