Samsung Dishwasher 4E error

Samsung dishwasher just started to have an 4E error code. Pulled the supply hose off and the inlet screen is perfectly clean, no desbris, looked factory new. Water pressure and supply are fine. While monkeying with it, I was testing and it gave me and oE error which is a water depth issue. I pulled the float and it was clean and moved freely. However, I have not been able to duplicate that error. I also took the opportunity to pull out the screen and guts inside and clean it up good. Ran after the above cleaning and checking and it fired up and began washing. Went through the whole cycle and near the end of the cycle, beeped a few times and flashed the 4E code again (I was in the other room and heard beeps). Question - is there memory on the error codes that I need to shut the breaker wait a minute and turn it back on? or Is it more likely that I need a new water inlet valve? It is not leaking water in, switch sound like it is opening and closing, at least while I was standing there for the start of the test. As always, thanks for your suggestions.