The user manual is available at this
site. But won't say much about F1 error except the flood switch has triggered. This means water has collected under the drawer in the main housing.
As the dishwasher was not used the drain hose must have cracked or the water inlet is leaking.
Water inside the dishwasher needs to be dried even if you fix the leak. check the
installation manual on page 7 to find out how to take the drawer out. Then inspect the housing drains etc and the inlet water connection tap. Get a few towels and dry the base and then put the drawer back and test.
If drain hose is crackedt then these need to be replaced.
Make sure you leave the mains power cable disconnected when handling the inside of the dishwasher.
Hope this works for you. It is a nice dishwasher but needs a good deal of care.Do post a comment to let me know.