Hello

My dishwasher is displaying the F12 error. After finishing a full wash the dishwasher was turned off and then the same day turned back on when it was filled with new load but then it did not turned on for a while and after some time displayed this error F12. I can't do anything as turning on/off does not do anything and pressing any buttons does not change anything too.
Is there a way that I can diagnose what is the problem, as now it will be hard to get some to come in and have a look at it.

Thank you for help
Model no is on attahced photo