Another thing that may cause the freezer to appear not to be working is the ice maker.
Samsung no frost fridge freezer not working.
Faulty temperature control may also be the culprit.
I have replaced both temp sensors in the freezer section and the bimetal defrost sensor.
I have a samsung rf267aa refrigerator and the freezer is not reaching the desired temperature.
I have checked and no ice buildup on the coils.
What you are probably going to see if you have a freon problem is only a small portion of the coils have frost on them.
If your samsung refrigerator is not cooling either in the french door fridge or bottom freezer it may be in demo mode and need a reset.
Or if your fridge or freezer is not cooling enough you may need more clearance space and to leave the doors shut.
If this fails there may be an issue with the compressor and condenser coils.
Freezer not freezing but the refrigerator section is working.
The panel says 2 or whatever it is set for but the actual temperature is much warmer.
The temperature switch might not be working properly.
When moisture freezes it becomes frost.
And may need to be replaced.
Frost forms in the freezer or refrigerator moisture forms in the fridge when warm air enters through a door being left open warm or hot items stored inside or compartments not sealing properly.