I cannot find any info on a 655 model.
Please check it. Below is info on a 665.
Here are your parts
Replacement parts for Kenmore 66515979992 | AppliancePartsPros.com
See the attachment for the tech sheet.
Looks like this is a multiple stuck keys error.
Could be the control board or the control panel (keypad).
Unfortunately the tech sheet does not give the wiring diagram for the control panel output.
Try removing power from the unit for a couple minutes, if the unit is then OK odds are that it is the control board.
Check for any mechanical problems with the control panel face.