Error Code C-21
Oven sensor short circuit or abnormally high internal temperature
Moderate
Address soon - your appliance may not work properly
What This Means
Temperature sensor short circuited; Broil, bake, or convection heater resistance incorrect; Relay not working normally; Wire harness disconnected; Oven sensor connector open
How to Fix
- 1
Disconnect power and measure oven sensor resistance (normal: 1080Ω at room temperature)
- 2
Check resistance of broil, bake, and convection heaters
- 3
Check if DLB, broil, bake, and convection relays are working normally
- 4
Check wire harness on Main PCB for disconnection
- 5
Check oven sensor connector resistance (normal: 2850Ω)
- 6
Unit displays C-21 after 10 beeps if temperature exceeds specification during operation
Other Error Codes for NV51K6650DS
Lower broil heater malfunction detected during self-diagnosis
PCB temperature rises abnormally high
Cooling motor operating abnormally
Partition inserted or removed while oven is operating
Steam sensor open circuit during steam mode
Oven sensor open circuit during operation
Keypad short circuit
Communication interrupted between Main and Touch PCB