Do you have a manual for the specific frig you have? That would be first choice but if not, I did a search online and found this manual:
https://norcold.com/wp-content/uploa...-21-06-n62.pdf
An upside down "u"? Would that look like an "n"?
Sounds like a reset might be a place to start but check the manual on that .
Page 17, seems it might fit what you describe? Click this snip to get a better view.
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Richard
Why no RV year, make and floorplan on MY signature as we suggest for others?
I currently DO NOT have one!
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