OK, thanks for that.
I think you may find the main control board has failed.
E51 indicates a failure of the motor triac. (main wash motor).
The can be because of a faulty motor, faulty wiring or a faulty main board.
Check the wiring to the motor, take the carbon brushes out of the motor and replace if worn away.
Check the main control board, located front right of the appliance and hanging down, for obvious damage.
If you have to lie the machine on it's side, lie it on it's left side so the water dispenser is the low point. If you lie it on it's right side you run the risk of water from the dispenser and dispenser hose running down onto the main control board.
If you need a motor and control board you will be looking at £300 plus for the parts.
In this case, I'd suggest checking www.domgen.com and phoning them for a price for a repair and 1 year extended warranty.
Sorry to be the bearer of bad news.
Check out the motor and motor plug first. Make sure nothing is disloged in the control board and try it again.
Hope this is of some help
Let me know how it goes.