We have had several problems with our refrigerator over the years and the Service Manual has proven to be invaluable.
Here is a link to the Norcold service manual for several refrigerator models.http://bryantrv.com/docs2/docs/ncoldnnewnseries.pdf
The refrigerator in our 2012 2551 is Model Number N621 hopefully it is the same model in your 2010 2551. The section in the Service Manual tilted "N62X/N82X DISPLAYED FAULT CODES" provides a good troubleshooting flow chart based upon the error code you are getting. This might be a good starting place to help you clear this problem.