how to fix washer/dryer bwd129 as keeps washing but not rinsing?

My washing machine keeps on washing but will not turn to the rinse and spin part of the wash without me physically changing it, I have tried all cycles but still dose the same, am not sure if it is actually washing the clothes as they dont really smell that clean when they come out, it could wash for hours and hours if i didnt change it to rinse, the paddles all fell off because of it, have replaced them but dont know how to mend it please help