Answer on AL03 error on Ariston LD-87 (LD87, LD 87).
Like the answer is correct, i discovered the same problem. Somhow the hose was full wit dirt and the pump was not able to put out the water. I followed the instructions on http://www.almesberger.net/ld87/al03.html and now its working again.
Please beware, after opening you might get an error H20. Just put off power from the mains and restart it.
Wim-Bart van der Waals, February 2008