If your washer fills, won't shut off and then overflows, this is caused by either a pressure switch malfuction, or a water inlet valve that won't shut off. The following link explains how to diagnose the problem and replace any parts (if required):
http://www.fixya.com/support/r3753517-whirlpool_top_load_washer_fills_when_not
I know the link is for a problem where the washer continues to fill even when it is not in use, but this problem occurs while the washer is running as well. The method of determing the cause is the same.
In many cases, an overflow problem is caused by the air hose slipping off the pressure switch. Without the air hose, the pressure switch never detects the pressure differential from the wash tub as it fills and won't shut off. This causes the washer to overflow and appear as a more serious problem.
Read through the link provided and let me know if you have any questions. If the conditions I have described do not match your symptoms, please post back and elaborate a bit more so I can help you determine the source of the problem. Please include your complete MODEL NUMBER. I hope you find this information helpful.
NOTE: "110" is the manufacturer code, which identifies the manufacturer of your washer as Whirlpool. Please include all the numbers that follow these first three numbers in order to properly identify the model of your washer. The model number is located on a nameplate along the wash tub rim under the lid.
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