I will assume that it is displaying an F1 fault, as this is the most likely cause. Check in instruction book to verify.
The best thing to do is turn the power off and remove the plug, remove the bottom drawer by pushing in the clips on side of the drawer ,just below the round plugs. The clips are attached to runners, push them back to release the drawer and ( after taking out the rack and spray arm) put the drawer on its r.h.side. Mop up the all water in the base, then remove the cover that goes over the back L.h. corner, this will expose the mains/flood switch board ( make sure you dry the roof of the drawer before you take the cover off , or water can drip onto the board .....not a good thing!!!)
To remove the cover, push in the clip in the middle front edge of the cover with a flat blade screwdriverand slide the cover foward a bit, then put the screwdriver under the clip and twist up, the cover should now pull off to the right. Spend a couple of minutes drying the board with a hair dryer and mop up any remaining water ( be careful of the board again). Refit the cover and switch back on ( you shouldn't need to force the cover on, just slide it on from right to left , but you may have to push down the cover just above the clip to get it to lock once it is located correctly). If it doesn't F1 again ,all good, if it does , remove cover and redry, and repeat until it doesn't.
To refit drawer, slide out L.h. rail and sit drawer on it, then lift right side of drawer and slide out other rail and sit other side down. If the rails don't want to slide foward and lock, lift the drawer at the front while sliding the rail fowarduntil the front edge of the rail is just at the clipping gap at the side of the drawer, then make sure the drawer is sitting down firmly on the rails and pull clips foward to lock. If the drawer has been clipped in correctly it will slide in and out nicely, if not , look at the back edge of the drawer when it is fully open to see where it is sitting too high and rectify by refitting the rail on the affected side/sides. By this point if any part of the bottom drawer was broken ,you would have seen it. Also check the top drawer by releasing it and pulling it foward,shine torch in and have a good look
Hopefully it won't leak again unless there is a faulty part not visible to the naked eye, check by running one drawer for a couple of minutes, stop the cycle and open the drawer and check the outsides for water ( don't be too worried if you see water in the bottom between the drawers as it will drip from the roof, unless the drain or fill hoses are split ) ,if ok, run the other drawer and check.
Remember, if you get to a point where you don't feel confident with what you doing or you think you might break something, leave it and call a professional to do the job, you may save money in the long run and if you going to expose wires or connections always switch off and unplug before removing the cover, you dont know whats underneath.
I hope this helps someone.