RV refrigerator need help
I have an ATC living quarters trailer with a Norcold N84xxx three way refrigerator. I bought the trailer used and last week I plugged in to shore power and turned on the fridge after 8 hrs or so it was cooling fine and continued to cool all week. When I went into the trailer today the refrigerator had quit cooling and the display said "no co" and there was an audible warning. I reset the contols and after a few hours the display went back to "no co" and the owners manual says it cannot be reset. Can anyone help me figure out what needs to be done short of taking it to an RV repair place.