This problem is commonly attributed to either a water inlet valve that doesn't shut off, or a pressure switch malfunction. The following links explain how to diagnose the problem and repair as necessary:
http://www.fixya.com/support/r3753517-whirlpool_top_load_washer_fills_when_not If the washer is not overflowing, the likely problem is the water inlet valve. If the washer fills to the point where it overflows, the easiest and most common cause of this problem is the small plastic air hose on the pressure switch coming loose. It can usually be fixed by simply reattaching the hose. However, read through all the information provided and double check everything to make sure.
Replacement parts (if required) can be purchased at any of the following websites:
searspartsdirect.com
pcappliancerepair.com
appliancepartspros.com
repairclinic.com
All these sites are reputable and have great service with competitive pricing, so shop and compare. The first three sites I listed also include helpful exploded view parts diagrams to assist you in locating and properly identifying the parts you need.
If you have any questions, please post back and let me know. I hope this helps you.
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