Whirlpool dishwasher e2 f2 error

This error code means poor communication between the user interface and the main control board. Open the machine’s door, flip the circuit breaker and undo the screws along the vertical parts of the inner door liner, which hold the door parts together. Move them apart very carefully and check wire connections between the interface and control board. If those are ok, there must be a problem in the interface. Replace it.