zanussi washer/dryer code E20 appears Britsh Gas unable to repair?

This code keeps on coming on the display when drying. Washing part is fine. Covered by maintenance so I thought British Gas have being coming since 11/06/07. Replaced a couple of things including valves. Still not working. I need help even professionals do not know
Jackie, July 2007
E20 Draining.
may need a new pump

phil grimshaw, July 2007
link Click here to see other fixes for Zanussi.