Hi, i have been on the hotpoint web site as my dishwasher is playing up and displaying error messages. I found this explanation for the AL10 error message;
Open/Short circuit fill valve traic - Book a service engineer.
Hope it helps. If you would like to have a look, past the following link in your address bar.
Hope this helps:-)
http://www.hotpointservice.co.uk/hs/pages/content.do?keys=FAQ:ERROR_CODES
Lynne.x.
January 2009