Your problem is due to the fill level switch malfunctioning. I had this problem and it was due to this switch being blocked and was simple to fix. You need to remove the right hand side panel(looking from the front).
There are You Tube tutorials on how to do this, but I can post details if you can't find anything.
Once the side panel is removed you must look for the circular orange switch near the front of the machine.
Then remove the black tube by compressing the clamp with pliers.
Blow hard into the tube until air passes freely through it. Mine did a kind of "pop" and then was free.
Then you can do a test run to see if all's well.
If so, put everything back together and be happy you've saved a repair bill!
Richard, July 2013