Hoover hnd6515 fault

Hi, my hoover hnd6515 has just developed a fault and i am in much need of some expert advice. When you power it on and choose and programme it fills with water then stops and drains straight away, the programme light flashes and emits a continual beep. I have stripped the machine down and checked everything that i could ie: blockages and sensors on a multimeter .Could it be the circulation pump as it seems to stop as it starts the cycle…..HELP PLEASE..lol
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UPDATE:
After a good look through the forums it seems the circulation pump that is fitted to my dishwasher is an askoll, up on taking it apart the impellor is very loose on the bearing. Could this be the main problem for the error and if so is there a better replacement pump as i could only find another askoll listed as a replacement…cheers