How do you put this unit refrigerator into a diagnostic mode ?

On this refrigerator you will need to press the energy saver key and the alarm key simultaneously for 8- seconds. All error codes will stay stored in unit if Error occurred. To get out of diagnostic mode you must unplug unit for 3-minutes. For other diagnostics and repairs click on the link below. https://www.appliancevideo.com/appliances/samsung-rf263teaesr-refrigerator/