This is a freezer evaporator fan error. The fan may be stalled by ice build up around the suction accumulator.
If it is freezing food in the produce compartment, the damper may be stuck open, also due to icing.
Best to remove the freezer evaporator cover and have a look. If you have another fridge, just let the faulty one defrost for 24 hours. This often solves the problem and makes removing the evaporator cover easier.
PM for a service bulletin if you cannot resolve the problem.
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