How can I fix demo code on Indesit WIXE127?

Washing machine keeps coming up with demo on the panel, I haveto let cycle complete. Have turned it off over night, tried reset on the memo, various button combinations, programme combinations.
Once cycle complete it resets but as soon as I press the start button it reverts back to demo. Agh
Have lost the manual and therefore at a loss.
Can anyone help???/