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The symptoms you are describing are most likely caused by a bad load sensing switch. The relay in the switch sticks and allows the washer agitate before it fills.
A simple check is to access the load sense switch and unplug the wires to it. Then check the operation. I have provided you with the instructions for accessing the load sense switch in the images below. I am also including the checks that can be made if you have a volt/ohm meter.
Always unplug or de-energize electrical equipment before removing covers or attempting service. Be careful and wear appropriate hand protection when working around sharp metal parts
Once the console is open the load sense switch is the switch that has the clear plastic hose connected to it. Remove the connector that has the violet, white and the blue with orange stripe from the switch. Then carefully plug the washer back in and start a wash cycle. If the washer does not do anything, you need to replace the load sense switch (part number W10177795). If the washer still agitates, the problem is most likely a failed timer (part number W10243947).
If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:
Sears Home Services
Here is a link that you may use to view the parts list diagram or to purchase any parts needed;
Sears Parts Direct
I hope this is helpful. Check the things I have covered here, and if I may be of further assistance, include more details in a reply to this post.