Hotpoint LFT228a

Hi all,
I got up this morning to a dishwasher full of half washed pots, yuk!
The machine looks to me to have stopped mid-cycle as if the door was opened.
There’s no error codes in the display and the bottom was full of dirty water.
The display works normally, you can set a program or the timer.
When working there is a bleep from the machine a few seconds after the door is closed but this is not happening.
Have tried a power cycle but it has not made any difference.
I suspected the door interlock switch was faulty and have tested this as ok.
Any Ideas?

Thanks