Problem with dishwasher

The machine starts OK, but then the programme no. 2 light flashes and the machine stops. This indicates that the filters need cleaning according to the trouble shooting guide. I have done this and there is no difference. Also sometimes the programme no. 1 flashes but not as often.
Any ideas as this has happened over a period of a week where it sometimes worked and sometimes did not.

Thanks for any help you can give