F-08 Heater relay stuck.
The relay is the item that switches the heater on. Its a small black rectangular component on the main board. Power off. Try tapping it sharply.
Possibly a duff connection on one of the board connectors. Power off, remove covers, disconnect circuit board connectors and clean with toothbrush. May help to tighten them with a pair of pliers. Clean off any corrosion or crud, refit and test.
Repair and service your own washing machine. Go to www.2ndwave.co.uk/manual.html
dannyboy, November 2008