E20 is a draining error code.
This is usually just a blocked filter. If you look in the bottom right corner on the front you will see a small square door.
Open this and there you will see the filter.
You need to remove this and give it a good clean. But if the washer is full of water you need to slowerly drain the water from there.
Once the filter is clear refit it and retry the washer and fingers crossed this should cure it.
E20 isn't a serious fault its just a draining problem which 8 times out of 10 its just a blocked filter.
If you need anymore info just get back to me.