Had the same problem and after doing some digging on the net found the following:
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"This is inevitably caused by a blockage. The small fabric conditioner compartment in the soap dispenser drawer has a removable plastic cap. This cap fits on the top of a tube which has a hole running through it where the water should siphon through.
When the time comes for the fabric conditioner to be released, cold water enters the small compartment and just washes the conditioner over the top and down the dispenser to the tub. When the water stops flowing all that is left is the clear water. This water should siphon up the inside of the cap and down the tube.
This tube often gets blocked with the conditioner and if you remove the dispenser drawer and take off the cap you can give the whole thing a good clean out. If the cap is missing, the siphoning will not occur.
To test the function, hold the soap drawer under the tap and allow the water to fill the fabric compartment to overflowing. When you turn off the tap, the remaining water should slowly siphon out of the hole under the cap."
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I'd already cleaned out the drawer - but obviously hadn't done it thoroughly enough. I've just now poked a q-tip into the little tube in the fabric conditioner section of the detergent drawer, cleaned out the excess gunk and it's now draining perfectly when under a tap, have yet to try a cycle and see if it has indeed fixed the problem, but I'm optimistic!
Hope this helps!!!!
Sarah
July 2004