Dyson Contrarotation Two Drum washing Machine- Child Lock On error Message?

I accidentally pressed the start button again once my wash was complete and it would not allow me to open the door to take out my washing. A message "child lock on" kept coming up. I got advice from the website about taking out the soap dish and turning the grey screw anti-clockwise and voila! the door opened. I have now put in another load of washing and closed the door, but the "child lock on" message keeps coming up disallowing any further washing. Does anyone know how to fix this without me getting an engineer in for £99.00?