It could be what the other Answerer has said and it might be rectified easily, Try this,
What has probably happened is that the small hole at the back of the condenser drawer (like at the back of older fridges) has become blocked.
Unplug your machine.
Take out the condenser drawer (the bit that you should rinse through every month) (check it is properly clean while you are there).
You'll need to get down on the floor for the next bit!
Put your hand right to the back inside the place the condenser drawer fits and feel for a gully..... it's probably full of wet sludge, hair and fluff!
Remove as much as you can with your fingers to the left but especially to the right.
After that, it should be clear enough for you to feel for the small hole down on the back right.
Get a thin plastic straw or plastic wire tie (don't loose it!) and poke it in and give it a wiggle.
This will allow the water to drain properly.
Let me know how you get on cinders2001@googlemail.com
J Ludbrook, January 2009
