If your refrigerator is in the sales demo mode, pushing and holding the ULTRA ICE and the REFRIGERATOR TEMPERATURE CONTROL buttons simultaneously for 5 seconds or slightly longer will reset the control to normal operation. NOTE: During sales demo mode, the compressor will not run so the unit will not cool. If your refrigerator is cooling properly, it is not in the sales demo mode.
If the control panel is locked, you can release the lock by pressing and holding the LOCK button for 3 seconds or slightly longer.
If your display is flashing an error code, then you have a component failure that needs attention. Explanations of error codes for this model are listed in the image below.
If you need more help with this refrigerator problem, resubmit your question with additional details.