How to fix my dishwasher/Dishlex (Supreme Deluxe)?

My Dishlex washing machine is an old unit and has only given me a problem with a inlet assesment valve about 6 months ago.Now when you turn it on it starts on a wash cycle immediately and is full of soap,and the only way to turn it off is to turn it off at the power point or let it run its full cycle. There is no display to know what part of the cycle it is on as that to all of the sudden isn't working either. Help on this would be greatly appreciated.