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FIXED Overheating code c-21 NE58K9850WS/AA Samsung range

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Premium Member
Mar 2, 2022
Model Number
1-5 years
I got an overheating Samsung DUO range. When I turned it on to 350 and put a meat thermometer in the oven the temperature is all over the place. it will go up 30 degrees, drop 50 degrees. I found it one time 450 degrees. a few times I have gotten the C-21 code when cooking or using the cleaning function.



The heating element ohm tests good, the temp sensors ohm test good. The fans are spinning. The only thing left is the PCB? Is that the likely cause? can I test the PCB? which relay operates the heating element?


also is the discloration around the lights OK?


Corrected model number
Last edited by a moderator:
NE59K9850WS/AA doesn't pull up as good, please recheck your model number. Read it from the model number tag on the machine.

Click here: Appliance Parts

Then you will see a link that says: How to find a model number.



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You posted NE59K9850WS/AA your model number tag says NE58K9850WS/AA

C21--->Over heating.

Unplug the range and check the resistance of the oven temperature sensor using a multimeter. You should measure around 1,100 ohms of resistance at room temperature. Replace the oven temperature sensor if resistance is off by more than 200 ohms. If the oven temperature sensor resistance is okay, replace the main control board.

Here's the temperature sensor for your model:
Oven Sensor DG32-00004C

Yes, the main control board you posted in your previous post is the correct one for your model.

That discoloration is normal, I see that a lot on my service calls.

Thanks for the reply. I am still noodling through this. The C-21 error is overheating, when the oven temperature moves significantly higher than the set temperature.

Is there a 3rd temperature sensor for that or do they rely on the 2 temperature sensors that regulates the temperature? (It seems odd that the safety check would rely on the component most likely responsible for the error in the first place)

Any idea how much higher the temperature has to be then the set temperature to cause the error code?
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There is no 3rd temp sensor.

Any idea how much higher the temperature has to be then the set temperature to cause the error code?
Nope, the service manual does not say.

You need to ohm test that oven sensor first.

the sensors are good, 1068 and 1060 ohm's in a cold house.

so when my range broke, I got 4 code 21's in a row. I took everything apart to test it and put it back together. It settled down after that and I did 2 hour long tests with my grill thermometer and the oven work perfect. Im not sure I am ready to call it fixed, but im going ti use it and see what happens.
Ok sounds good.

same problen surfaced again. temp sensor and heating element all ohm tested good.

I just ortdered the PCB. The price already went up from when I was looking a month ago!

I should have just fixed it then.

I did see the issue this time, the top oven burner overheated and wouldnt cut off.
Ok, then yes the PCB should fix it.

Let us know how it goes.

cooked 5 or 6 times with the new PCB and I am going to call it fixed.
Jake, Thanks for the help.
Excellent @2ball glad to hear the new PCB fixed it.(y)

Thanks for the update.

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