Dishwasher only heating water - blades not...

We were recently given a Hotpoint DF53 dishwasher. It was a little troublesome to install (various problems from not letting water out to no electricity going in) but that was all resolved in late January. Last week it stopped working. Firstly, I set it running, only to return a couple of hours later to find that the dishes were wet, soap not disolved and all clamy inside. The light was on indicating that the dishwasher was still running a cycle, but no noise. I checked and the lower blade had fallen off. I replaced this, closed the door and the water started swirling again. It all sounded fine, so I walked away again. When I checked a few hours later, the cycle had not continued. It was clamy and the water at the bottom was warm. The light was still on. The soap still not disolved although the dishes were slightly better than when it had stopped before. We haven't been able to get it going again. We'd really appreciate the help. Thanks