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HI my name is Robert...
This is going to be an issue with the circuit board or upper control panel inside. To start go unplug all the connectors and make sure they are clean and tight, and no wires have come out of the connectors. I have seen this only twice before on the same model and it ended up being the lower circuit board on one and a wire that came out of the harness near the board on another. The display inside could also be at fault but you are limited on testing. I can see if there is any troubleshooting for that... Hope this helps, IF you have more questions or concerns please feel free to contact me...Robert
I took a look in the service manual and there is nothing for this issue you are having. I would check all your wire connections very carefully, check them at the circuit board outside and then at the control panel inside, make sure no wires have come out of the connectors. After that I would replace the lower board, from my experience it would be an issue with the circuit board. IF the board does not solve the issue has to be the display panel.
My goal is for you to be satisfied with my efforts, IF you would like to try another expert please let me know, I only get credit when you select a rating... Robert
Hi I see you have not selected a rating, if you still need more help on this please feel free to contact me... Robert