wd640 washer dryer 2 minutes on display?

wd640 hotpoint washer dryer\r\nthe time display is showing two minutes if i accept this and the machine runs its goes to 'end' and then when i select a new program it goes back to 2 minutes - it has been doing this intermittently but now it constant - does anyone have any suggestions??\r\n
Many thanks

Tina