i have just had the same problem with my diplomat ADP 8332 dishwasher, It flooded the other day, since then all it would do is fill up empty straight away then bleep and show the code FA !!!!!!
All i have done is take dishwasher out tip up the front about 45 degrees and water came pouring out the drain hole at the back of the dishwasher, I mopped this up and it reset just fine and is now happily washing away, hope this helps
Mark Shaw, October 2008