Error Code C-21
The internal temperature rises abnormally high.
Moderate
Address soon - your appliance may not work properly
What This Means
Defective oven sensor thermistor; Short in heater relay circuit; Damaged PCB pattern; Main PCB malfunction
How to Fix
- 1
Disconnect power and remove display PCB
- 2
Replace main PCB
- 3
Reconnect oven sensor after replacement
- 4
Check DLB, Bake, and Broil relays (should show infinity ohms when open)
- 5
Inspect for damaged PCB patterns
- 6
Measure oven sensor resistance (should be 1 kΩ at room temperature)
- 7
Check harness connections related to oven sensor
- 8
Verify connector and harness at CNS600 on main PCB are properly seated
This Error Applies To
Samsung NE63T8751S Series Ovens & Ranges
Related Error Codes
There is a short in the control key.
The door lock is misaligned.
Communication between Main and Sub PCB is interrupted.
Communication between Main and Touch is interrupted.
The sub PCB temperature rises abnormally high.
The oven sensor is open when the oven is operating. There is a short in the oven sensor.
The sub PCB sensor is open when the oven is operating. There is a short in the sub PCB sensor.
The temperature probe sensor is short when the oven is operating.