Hi there, With the model number provided I was able to narrow down the search for your refrigerator model. I attached the link below. If you have the full number, just click on the correct model number to view the manual. It should have a list of codes and meanings. I also see that someone else asked a similar question. I included the expert post below. Hope this helps!
There is no error code listed for Error 15. It is likely a control board failure. Try resetting the control by disconnecting the power cord for a couple of minutes and then reconnect the power cord. If the error recurs then you will need to call for service. Call 1-800-4MY-HOME or 1-800-469-4663 to set up a service appointment.