It may be the pressure switch that is not switching off the cold fill, Try cleaning the small tube at the base of the drum, there is a small plastic bottle with a plastic tube going to the switch and over time this becomes clogged up with detergant, This bottle has a small hole in it & the idea is that when the machine fills with water this increases the air in the plastic tube to the pressure switch & 2 contacts make & shut the water off
Rob Knights
December 2005