Error Code C-21

Oven sensor is short when operating or internal temperature rises abnormally high

What This Means

Oven sensor resistance out of range; Broil, bake, or convection heater fault; DLB, broil, bake, or convection relays on Main PCB malfunctioning; Wire harness on Main PCB disconnected; Oven sensor connector on main PCB resistance abnormal

How to Fix

1. 1

   Disconnect power; disconnect sensor harness from sensor; measure sensor resistance (1080 ohms at room temperature); replace oven sensor if abnormal

2. 2

   Check the resistance of broil, bake and convection heater

3. 3

   Check whether DLB, broil, bake and convection relays on the Main PCB are working normally

4. 4

   Check whether any part of a wire harness on Main PCB is disconnected

5. 5

   Check the resistance of oven sensor connector on main PCB (Normal: 2850 ohms)

6. 6

   Unit will display C-21 after beeping 10 times if temperature is higher than specified during operation

7. 7

   Reconnect after replacing the oven sensor

8. 8

   Replace or repair the harness

9. 9

   Replace Sub or Main PCB as needed

This Error Applies To

Samsung NV51R5511D Series Ovens & Ranges (2019) (2019–present)