Model #: MVW6230HW What is the F3E2 error?

The F3E2 error code on the model you listed means there is an inlet water temperature fault and is usually caused by a shorted or open inlet thermistor, which on that model is located inside the water inlet valve. The only thing you can really do for that error is just to replace the water inlet valve on the washer. The upgraded valve you need to order and replace can be ordered from the link below:

https://prismparts.com/products/whirlpool-washer-water-inlet-valve-assembly-pp4459236