I have an Indesit WE 16 which is displaying F-02?

The machine has been working well for 3 years, the other day it washed perfectly then come the next wash within minutes of the completed one the door lock simply locked. The timer display 'ticked' on but no water entered the machine. After several switch on/off/ change programme attempts water entered, the drum turned a few times and the display is now showing F-02. I have checked the pump filter and that is clear and the extraction pump seems to be operating. Any suggestions before i buy a new machine?