Error Code C-21
Oven sensor is short or internal temperature rises abnormally high when oven is operating
Moderate
Address soon - your appliance may not work properly
What This Means
Faulty oven sensor; Shorted relays (DLB, broil, bake, or convection); Disconnected wire harness on Main PCB; Abnormal heater resistance
How to Fix
- 1
Disconnect power and disconnect sensor harness from sensor
- 2
Measure sensor resistance (normal: 1080 ohms at room temperature); if problem, replace oven sensor
- 3
Check resistance of broil, bake, and convection heater
- 4
Check whether DLB, broil, bake, and convection relays on Main PCB are working normally
- 5
Check whether any part of wire harness on Main PCB is disconnected
- 6
Check resistance of oven sensor connector on main PCB (normal: 2850 ohms)
- 7
Unit will display C-21 after beeping 10 times if temperature is higher than specified during operation
- 8
Follow diagnostics steps from page 28
This Error Applies To
Samsung NV51R5511S Series Ovens & Ranges
Related Error Codes
Oven sensor is open when the oven is operating
Door lock is mispositioned
Communication between the Main and Sub PCB is interrupted
Power connection is installed improperly
Communication between the Main and Touch PCB is interrupted
PCB temperature sensor is open or shorted when oven is operating
Cooling motor is operating abnormally
Keys are shorted