Fridge would work until battery voltage dropped below roughly 10.5V when it would just turn off.
The RED led light ON means that the recall box has tripped power to fridge.
Tripped either due to a high-high temp being sensed which is what the recall box install was designed to do..........prevent fridge fires
OR
The recall box has faulted.
There is a 'fix' using a magnet to reset box. I don't recommend because what IF it really was a high-high temp excursion.
Have you tried turning fridge OFF then back ON to try resetting?
Probably won't work.
Call Norcold....have RV Tech check box (if faulty replace) and check for high-high temp problem.