E11 is a water flow issue. Make sure water is on, hoses aren’t linked, screens in hoses and valve aren’t clogged with debris, and that hot and cold hoses aren’t reversed. If all that’s ok, then water valve probably needs replacing
As you say bought new suggest you contact suppliers and under guarantee should be replaced free of charge . hope still under guarantee time limits shouldn't run might cause damage ?
1st, unload the machine and see if it works when started again.
second, you may have a control panel defect - no fix other than replace the control panel.
not user repairable unless you are an electronics technician, so... take it to a repair shop where they have experience with that model.