Reefer problems.

As I understand it from Norcold, Rev C cannot be reset in the field, and no, you cannot simply replace that unit yourself...think liability for Norcold. Unfortunately, while that red light is lit, your fridge will not work. Time for a call to your nearest repair center....Dennis

(There is a way to reset that box, but it's not recommended as resetting without proper monitoring may result in a fire, which is why I didn't post it here.)