@billstrang , B.Strang, You did not state your model#, so my answer will be sort of generic. As a first step turn power off to machine for (10) minutes and see if it resets. Whirlpool gold series dishwasher error code e2/ f2, means main control board is not getting correct signal from the user interface. Turn off power/breaker, remove screws holding inner door liner, remove liner and check/secure/clean all wire connections from front interface and main control board. If all good and still not working the user interface is probably faulty and has to be changed. Check the attached link,instruction and guide on how to access control and wires, Good luck.
I hope this helped you out, if so let me know by pressing the helpful button.
https://www.youtube.com/watch?v=rZMU8T7Nn7U