Jon C Mount Carmel , IL May 07, 2017 Appliance: Model KITCHEN AID, KHHC2090SSS2 Multible starts up being ready to run Replaced Main control board, screen board and controller. This unit is mounted in cabinet, over Range. Moisture sweated the unit, and it wasn't vented to outside, also. Ribbon wire from control board to screen corroded, and was causing the main problems, and snapped when trying to install the new control board. Had to order, and awaiting that part. That should be it... Read More... 2 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 2+ hours Tools: Wrench Set