Whirlpool Autosensing washer overfills

[Drew99GT]

I have a Whirlpool washer, part number WTW4616fw1, that overfills! 

I did some checking, and it apparently has no pressure valve for the water level, just the water inlet valve.  I website I found said to unplug it while it's filling, if it stops, the inlet valve is fine.  If it continues, it's broken.  It passed that test.  What else could it be?!?  Is there another sensor somewhere?  Thanks!

[MrApplianceMatt]

This unit has a water level sensor that is integrated into the main board. If you pull the back of the cabinet off, you'll see a clear vinyl hose that runs from the side of the tub up into the console. Check the tube for crud buildup near the tub. The hose is generally held on with a small spring clamp, if it has any clamp at all. The change in air pressure in this tube as the tub fills up informs the sensor built onto the main control board as to how much water is in the tub. Two schools of thought: either there is a buildup of crud in the pressure tube preventing an air pressure change or the sensor on the board has failed and would require the replacement of the main board. There are diagnostic procedures in the tech booklet located on the inside front of the machine. The machine stores error codes that can be retrieved and evaluated for their relationship to the overflow condition. 

[Far field]

Good Greef Charlie Brown