how can i get rid of the AL01 fault code on a hotpoint DWF 70 dishwasher?

I have tilted my dishwasher back over 30 degrees,layed it on it's side,& it still does not work!The water droplet sign on the control panel is illuminated,indicating a leak of some sort,but can't seem to locate any water coming out of the machine.Could it be a spurious warning?