888 means the PC board is shorted and the display driver that shows what supposed to be a display is not working,I would take the PC board out of the machine,look for water corrosion,it will be like a white puffy kind of stuff,if you see that,you have water damage from some other part inside.Try electrical cleaner but you would probably need a new PC board at that point.Look at all the boards while you are inside the machine.
Make sure its unplugged,dont get electricuted!Very important! If its sears,thats kenmore and thats GE.So you can get parts via Sears or ebay or amazon.Good luck,report back!