hoover nextra hnf 6167?

my hoover washing machine really plays up it has trouble selecting programme. what happens is if you select say 40 or 60 wash the 15min light comes on instead of start light so it will only do a short cycle.if you keep turning selector knob from off to the programme you want eventually it selects it then works. sometimes it can stop during the cycle and just get confused stopping and starting. it it the selector knob or pcb maybe any ideas?

owen159
March 2010