Same issue here! LG dishwasher LDFN343. The panel blinks like Christmas lights and beeps as well. I took it apart after tripping the brake on the panel. Seal the void with tape, I drilled a few small holes for ventilation on the bottom of the panel. Now there is a vapor barrier between the electronic board and the interior of the door. I also sprayed 40WD inside the control board and connector to keep it moisture-free. It works now...time will tell.
Thanks for all your comments and advice!