Re: Ariston Li 680 duo
First of all I will move your post to the Dishwasher forum from the Washing Machine forum. 😉
It looks as though you are posting from Espana, the model number you have given is not sold here in the UK.
Looking at the nearest equivalent machine I think your error code indicates a heater fault.
A very common fault on these machines. First of all you need to remove the mains power plug and then test the heating element for continuity, resistance and insulation.
If the heater is OK then your control PCB/electronic circuit board will almost certainly be at fault.
Both the heater and the PCB are known to fail a lot on these dishwashers.