The E1F2 error code indicates replacing the
board. It is in the realm of possibilities that your new board is
defective. If I were certain the board was good I would focus my
efforts on tracking down an electrical fault.
The likely failure is the control panel; however it could be the control board.
Since you did replace the control board already, the problem is most likley a key pad that is sticking.
added a portion of the technical data sheet in the image below. You
will need an ohm meter to be able to check the key pad operation. I
added the information needed in the image below. If the control panel
tests OK, replace the control board, if it fails, replace the control
panel.You may need a hands on tech to run these tests and diagnose and repair your oven. Or just buy the key pad controls. Check THIS LINK
Here are the parts
Replacement parts for WHIRLPOOL KEBS208DSS8 ' AppliancePartsPros.com
Here is a manual and a tech sheet
Hope this helps; also keep in mind that your
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