I have had an AL03 code - in my case it meant that there was an obstruction to the water outflow into the drainage pipe under the sink. The connector that connected the outpipe to the sink drainage contained a small anti-return valve, which isn'treally needed. My handyman removed the valve, and all was well after.
Now, 18 months later, my machine is showing an AL10 code. Rats.
Geoff Penn, July 2007