How can i clear F12 fault code on Bosch WFXi 2840 WM?

Our washing machine needed rinsing to remove smell. I put it on 18 minute rinse and stopped it after a couple of minutes when full of water and emptied by unscrewing pump cap. When i switched back on F12 fault code came on & it won't clear whatever programme I try. I have manually put water back in the drum but still no success. In the handbook it says water in base pan. Any ideas how to clear fault code.