Wot does it mean if display says door on hotpoint ultima dishwasher

SOURCE: Hotpoint Ultima dishwasher DF32

you are probably plumbed in under the sink for the drain hose. a common problem is water coming back down the drain hose when you empty the sink. if so take the drain hose up as far as possible in a swan neck. other possibility is a leaking fill valve

SOURCE: what does code al99 mean

AL99 is a communications error.
check PCB(s) cabling, connectors .

SOURCE: Hotpoint Ultima dishwasher dwf70

hotpoint dwf 70 start the machine 2 minuites later stops light comes on al05 appeers water starts to leek out.

SOURCE: Hotpoint Ultima BF71 Dishwasher 'F' code

clean out all the filters at the bottom of the dishwasher thorouly and the saltcontainer as well.
the f code is for filters.

SOURCE: AL04 flashing on dishwasher screen its a hotpoint ultima thanks

here's the free manual:
http://kitchen.manualsonline.com/manuals/mfg/hotpoint/fdw60_fdw65.html