There flashing means it is trying to tell you something, like what it thinksi mght be wrong.
These might help but there's more out there for those prepared to search
https://howtomendit.com/answers.php?id=257840
https://electrolux-dishwasher-errors.com/
https://www.markrobertshaw.com/2017/02/09/how-to-reset-the-anti-flood-device-on-your-electrolux-dishwasher/
Ehehehg, March 2021