Model Number: KDTM 354DSS0
Brand: KitchenAid
Age: 1-5 years

This is a higher-end model with the touchpad hidden inside the door (not on the front). There are no physical buttons to push, it just senses the touch. Recently Start button would not always recognize a touch. The dishwasher worked great when we could push start up until yesterday. Now we can't select START. It appears CANCEL button may not work either (we don't usually use it, so not sure). These two buttons are on the far left of the touchpad, by the way. All other buttons to select wash and dry options light up and seem to work, but we can't start the machine. Ran the service test cycle and all lights on the panel lit up including start and cancel. It then ran through all the cycles fine. But, the start button still doesn't respond.

How can I determine if I need to replace the control panel or the touch pad? Thanks for any advice so I order the correct part.

Existing part numbers are: Touchpad W10537423-A and Control panel W10539792-Rev C