Problem with Indesit washer dryer WD10 [UK]?

The program dial keeps revolving and the LED flashes 5 times. Which is error code 5, indicating trouble with the pressure switch.

I have taken the pressure switch out and tested it with a contituity tester and it seems to switch fine when there is a little pressure blown into the nozzle. I have also cleaned out the filter on the front of the machine. I then reset the maching by turning to the reset position and powering down for 5 mins. Sadly none of these things has corrected the problem.

I was hoping someone has experience of these machines and could tell me what to try next.

Thanks for your help