I have an error code: Upside down F and E

I've replaced the heater element, temperature sensor, control and display board. I have also replaced the inlet and outlet for water, washer door lock, and the outer tub.

Any one come across this type of error code before or any ideas what I may still need to replace, change? Or is this washer a lost cause?

To day I finally figure out the problem. Remove the washer motor rotor cover to check the wires and notice the washer thermistor that I replace at the connector the white wire was loose or fell out of the connector.
I splice the wire and connected back and tape it up so it wouldn't fall out.