I have just had a similar problem and fixed it today.
The "Empty Water" light was staying on and no heat was given out to dry the load.
I found it to be the float switch in the condenser unit at the back left. It had stuck with fluff and debris. I cleaned out the condenser reservoir and the polystrene float and now all is well.
To get to this unit you must first,
Take of the top and the left hand side panel.
Locate the 2 locking tabs that hold the top half of the condenser onto the back panel and release this part.
Remove this by releasing 2 further tabs that hold it to it's bottom half,
and you will see the float switch assembly on the left hand side.
Clean out the condenser reservoir of any water and aslo clean the polystyrene float, it needs to be free to slide up and down between the plastic guides.
Hope this helps.
JohnM
JohnM, August 2008