How to re-set a tilt & turn window
In the unlikely event that your tilt and turn window becomes stuck between both positions at the same time the mechanism will need to be re-set:
Apply pressure to the top hinge corner so it tilts back into place.
Push and hold the mishandling lever (this can be found on the edge of the sash just below the handle). Turn the handle downwards to the vertical position then turn it again into the upwards vertical position. Release the mis-handling lever.
The sash should now be in the turn position, and the handle in the vertical position. Shut the window and bring the handle down.