A samsung fridge RF4287HARS has error codes 40E, 21E and 22E

5E: Fridge Defrost Sensor Error

https://www.samsung.com/us/support/troubleshooting/TSG01003409/

It indicates a fault of the defrost sensor. This element acts as a switch between the timer and the heater.

21E or 21C.

https://www.google.com/search?q=samsung+refrigerator+error+code+21c

21E

Freezer Fan Error This means the electronics are not sensing rotational feedback from the fan when it's supposed to be turning.
This usually means the fan is frozen up, which can be caused by the door being left open or if there is a gap in the door gasket when it's supposed to be closed. It could also be fan motor failure.
If you wish to defrost the unit, you can, otherwise visit our Support Center to request service.
In addition to defrosting, make sure the unit is not packed so full that it prevents the doors from closing completely. Check that the door gaskets make a full contact connection all the way around the door.
.

Hi! Please check the Troubleshooting part of the manual to this Samsung fridge. Hope it will help! https://manualsbrain.com/en/manuals/1290202/?page=39

get in a technician to diagnose the faults

Existing error codes for Samsung fridges run from 1 up to 13, in the majority of models as far as I could find out.
You might be having two error codes instead of one code
error 1 and Error 5.
Error 1 refers to 1. Ice Maker Sensor:
Ice Maker sensor connector missing, contact failure, electric wire cut, short-circuit, Ice Maker sensor failure.
Indicates an error when the temperature sensed by Ice Maker sensor is higher than 150 or lower than -58.
Error 5 refers to 5. Ice Maker Function Error:
Ice ejector and level failed three times or more.

What is the model number of your refrigerator? There are many error codes I need to know what we are working with
APPLIANCE 911

My fridge got flooded for about 2 feet. But after the flood water was gone, I plugged the fridge and it was working. We moved out of the flooded home a year ago and I left the fridge (I deep cleaned the fridge of course) in a storage room for about a year. Now moved the unit to my garage and I was planning to use it as a backup fridge for some chemicals (not food related). However when I plugged it, it shows the error 23e and both fridge and freezer do not work. It is going to be an easy fix or should I let it go, considering the story?

I have RS2555 in same problem.my warranty is expired and Samsung hooked me up to an technician who asked for 300.00 for labor plus parts and tax, what a rip off!!I I called my Canadian friend who's a technician and I was told to POWER OFF the RS2555 for 24 hrs.both doors MUST open and take out all drawers,he said ,it is 90% the ICE blocked the cool airflowing,so if ICE melted,all will return to normal.
It works after I did what he said.share this and hope can help some one with same problem!

I copied this suggestion from another web site. The 22e error is apparently a blockage of ice. Hope this helps.....

Try lighting and freezer for 3 seconds, or until you hear a beep. (The 2 left on my model) This worked both times I had the issue.