Error Code C-21
Internal temperature rises abnormally high
Moderate
Address soon - your appliance may not work properly
What This Means
Faulty oven sensor; Defective heater elements; Failed relays on Main PCB; Disconnected wire harness
How to Fix
- 1
Disconnect power and measure oven sensor resistance (normal 1080Ω)
- 2
Check resistance of broil, bake, and convection heaters
- 3
Check DLB, broil, bake, and convection relay operation
- 4
Check wire harness connections on Main PCB
- 5
Check oven sensor connector on Main PCB (normal 2850Ω)
- 6
Unit displays C-21 after 10 beeps if temp exceeds specification
This Error Applies To
Samsung NQ70M7770D Series Ovens & Ranges
Related Error Codes
Keypad keys are shorted
Door lock is mispositioned
Communication between Main and Sub PCB is interrupted
Partition inserted or removed while oven is operating
Communication between Main and Touch PCB is interrupted
Gas sensor value out of range (below 5 or above 250)
Steam sensor is open or shorted when steam mode is on
Water draining issue - water level sensor detects remaining water after maximum draining time