At the end of cycle washer will not stop filling and overflows. maytag neptune fav6800aww

If I could ask this question for clarification; “”at the end of cycle washer will not stop filling and overflows. maytag neptune fav6800aww””
It sounds to me that one of the Washer Water Inlet valves is not closing completely ad end of the completed wash cycle selection. You go to remove the completed wash load and water continues to flow is that correct?
1. If you pull the washer 120VAC power cord does water continue to dribble/flow into the washer?
If so you have a Water Inlet valve not seating, crude in the valve seat.
If it’s a Water inlet valve not seating and you are handy changing out the Washer Water inlet valve assembly it’s fairly easy to remove and replace. Let me know the answer to question 1. and we will go from there.

The Service Manual for reference. Sears Parts Direct for reference.

See page 35/36 to access, remove and replace the water inlet valve assembly..

The part number for the inlet valve is 12002242. There is a Substitution P/N 25001046 If you DIY you may want to consider a local purchase, take your water inlet valve assembly to the parts counter and make sure the 120VAC connectors on the solenoids match up. The water inlet valve is easy to replace just follow the SM.

I’m an owner like you let’s see if we can solve the issue……Rich

There is a diaphram switch located in the machine at the bottom right in the rear. When you remove the front panel it will be all the way back on the right. It senses the water level. It has three levels it detects. I had a problem with mine filling too much. That should take care of your problem.