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If the washer control will not accept the commands to lock or unlock the user interface, the user interface may have a stuck key and need to be replaced. Make sure you are using the correct procedure as follows;
The Control Lock avoids unintended use of the washer. You can also use the control lock feature to avoid unintended cycle or option changes during a cycle. When CONTROL LOCKED is lit, all buttons are disabled except for PAUSE/OFF and START. You can lock the controls while the washer is operating.
To lock the controls
Select and hold CYCLE END SIGNAL for 3 seconds. The CONTROL LOCKED status light glows.
To unlock the controls
Select and hold CYCLE END SIGNAL for 3 seconds until the CONTROL LOCKED Status light turns off.
You may want to disassemble the console and ensure that the buttons are not restricted. I am including disassembly instructions in the images below. If the user interface does not accept this command, I recommend replacing the user interface (part number 8182150).
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 and for parts purchases;
Sears Parts Direct
I hope this is helpful. If I may be of further assistance please reply to this post.