You can order the part from appliancefactoryparts.com
You need to replace the entire control board. The display is built into it, but it is easy to replace.
You just need a screw driver to install the display control panel.
To install the part, do the following:
Turn off the unit and unplug it.
You need to remove the screws on the back of the unit and remove the back. It slides up. Then slide the sides toward the back. You need to remove the side without the water canister. The side with the water canister just needs to be slid back enough to reveal the screws at the top front of the unit holding the display. Remove those screws on both sides and gently pull the top front display cover off. There is a long ribbon (similar to one found on a hard drive in acomputer
, which is exactly what this is) with a clip that attaches to the main control panel on the left side of the unit. Remove that (noting how and where it attaches - I mark everything), take apart the inside of the front panel to reveal the display board, remove and replace it along with the water tight seal. Plug the new display into the control board, reattach the top front panel to the body of the machine, reinstall the water container, plug it in and turn it on to see if it works. Mine did and so I reinstalled the sides - they just slide forward, then I reattached the back and the machine was good to go.
Hope these instructions help.