my indesit d4000 dishwasher works ok for about 55min.then?

my indesit d4000 dishwasher works ok for about 55min.then i have to operate it manually untill it ends the program (any program 1 or 3) and after it finishes i find water at the bottom. pls someone advice
ps.i bought it used and i don't have manual if u can pls. tell me where can i get it from(soft copy by internet)
thanks a lot