E4 indicates the anti flood device in the base has been activated.
Look below the door.
If you have an access panel, unplug the appliance and take the panel off.
Remove the water in the base and try the machine again.
If no panel.
Empty the machine.
Take it out.
Put a towel across the bottom rear.
Tilt the machine rearward about 45 degrees and drain the water out of the base.
Try the machine again.
If all is well, it will work again.
If it starts working and stops with E4 again, you have a leak.
Take the side panels off.
Drain the base again.
Watch it working.
You need to locate and cure the leak to rectify the fault.
Hope this helps
Let me know how it goes