Pull bottom drawer out as far as it will go. Shine a torch through the gap under the drawer & look to see if the floor tray is still wet. Leave it for a day or two to dry out & when dry the F1 will go away. Then use just one drawer for a couple of washes. Check tray again. If dry use the other drawer. That way if the water comes back you will at least now which drawer is leaking.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix washing machines.