Samsung fridge freezer model no: RS21DCNS

IT means that you have not fully defrosted the fridge in sometime.(should be done every 6 months max).switch it off,let it fully defrost for 12 hours,then restart,should work fine(i hope).

I like 0 to 10 Deg. F in the freezer.

As for the Fan. yes it could be ice or the fan blade hiting the shroud, sometimes the fan blade moves on the shaft and starts hiting the shroud.

This is caused by the ice building up in at the back - the fan catches the ice and eventually will stop. With the fan malfunctioning the temperature will rise and the light then flashes. Keep searching the web, and you will find instructions how to remove the back and de-ice it. I had exactly the same problem 2 months ago. Make sure that it is fully de-iced, including the tray at the bottom. Ours has worked OK since!

samsung fridge freezer problem

samsung fridge freezer diy help

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the problem is going to more then likely in the main control board which is on the back of the refrigerator in a little compartment this board is bad about going out if you have power surges or outages

very common issue on samsung r21 models , repair kits available and plenty of help videos out now

have a look at this youtube video and the chanel it belongs to

Check to see if the fan is blocked by ice in the freezer compartment

The middle part of my refrigrator (RS21DCNS) is full of ice. i have removed ice many times. could you tell me whats the reason and solution of this?

Sounds like u need to replace fan motor

Check fan motor for continity IF none replace fan motor

press for diagnose the power freece and power cool, you will get an information about the self diagnosis. you can call samsung and will get a clue what is going on. maybe the heating is not working well.