My Diplomat Dishwasher. Error message?

I've just inherited a Diplomat dishwasher but no manual. I set it running and it gets part way through the cycle then stops. There's an LCD screen that reads E3 but I have no idea what it's referring to. Also there's a stinking pool of water in the filter and in the salt compartment is perminently full of water is this normal? It's my first dishwasher.

Cheers!