I have a Kenmore Pro Refrigerator (401.40483800, made by Samsung and similar to the Samsung RS757LHQESR). The refrigerator is not cooling enough and the evaporator was a block of ice, so I tried to have the unit enter a manual diagnostic/defrost mode.
I pressed the Fridge Temperature and Freezer Temperature buttons for 6 seconds, based on reading instructions available for similar models online. The compressor stopped running and the fridge and freezer temperature displays changed to "0F", which I thought meant it was running a defrost cycle, but now I can't get it to return to normal operation.
I've turned the device off and on again several times, and pressed and held the fridge and freezer temperature buttons again (and many other combinations of panel button presses) to no avail - it is now completely unresponsive. What can I do to restore the refrigerator to operation?