Repairing an Indesit 161 - programme dial keeps turning round?

As reported previously, the programme dial keeps spinning around as the machine fills and empties. Many thanks for your quick response and advice, Phil. We bought a new temperature sensor and replaced it, and dried the mother board with a hairdryer but to no avail. The machine flashes 12/13 when the On button is pressed, then the machine starts to fill and empty while the programme dial turns continuously through all the programmes. It keeps flashing 3 when it does this. Any other ideas would be appreciated.