that code is the circulation pump, which is the larger of the two. I had the same problem and followed Ian's directions here
http://www.howtomendit.com/answers.php?id=13831
or pasted here
Hi,
AL 03 seems to be a common fault which manifests itself quite soon after the gaurantee expires!! Typically, the manual only states obvious fault codes, otherwise get ready to part with £100 for a callout. Basically, i've found that AL 03 means that the drain pump is not functioning. (This will be obvious because there will be water in the machine when it fails). This can be due to a mechanical or electrical fault but more than likely a bit of debris has become trapped in the blades or impellers of the pump.
In my case, I spent ages poking about about with bits of wire as advised to clear any stuff from the holes at the bottom of the filter hole as well as using a a 5" sink plunger to try to dislodge any bigger matter. Anyway, I ended up siphoning out the water, blasting with garden hose, siphoning again all to no avail. Eventually, I put the unit on it's side and removed the cover plate from the bottom of the machine. Don't remove the two screws in the middle of the plate(they hold a water sensor in place) just take out the 6 screws around the outside and remove the cover carefully. Once you have located the drain pump, remove the drain hose clip and ease the hose free. The pump is held in place to the drain exit with only one screw. Remove this and turn the pump body clockwise to free the locating lugs. Then you can withdraw the pump for examination. The electrical connection is easy to see and remove so you can do this in comfort. Unbelieveably, the cause of all my problems was a a bit of woody apple stem about 5mm long. Unfortunately, after putting it all back together and proving that the drain pump was working, the filter absolutely clear and the main pump working perfectly the bl**dy thing decided to report an AL 05 fault which IS in the book and just said to clean the filter but that's another story!!
Ian
August 2006
I then ignored the smaller pump and turned the spindle of the larger one near the back with a small screwdriver. Got it moving then found the moving parts using a torch and gave a squirt or two of WD40 so it was moving freely. It then worked fine. My problem was that the dishwasher hadn't been used for a bit so the pumps had got sticky. Maybe yours is bust but doing the above is worth a try!
Patrick Wrigley
August 2008