Error Code C-21
Oven sensor is short or internal temperature rises abnormally high
Moderate
Address soon - your appliance may not work properly
What This Means
Temperature sensor short circuit; Heater stuck in on state; Faulty relay not cutting off heater; Damaged sensor connector
How to Fix
- 1
Disconnect power and disconnect sensor harness from sensor
- 2
Measure sensor resistance (normal 1080 ohms at room temp)
- 3
Check resistance of broil, bake and convection heater elements
- 4
Check DLB, broil, bake and convection relay operation
- 5
Check wire harness for disconnection on Main PCB
- 6
Measure resistance of oven sensor connector on main pcb (normal 2850 ohms)
- 7
Replace Main PCB if temperature remains high during operation
Other Error Codes for NV51M9970SS
Meat probe sensor is shorted when oven is operating
Drain system problem or water remaining after draining (water level sensor issue)
Steam sensor is open or shorted during steam mode
Cooling motor operating abnormally
Door lock is mispositioned or not operating
Communication between Main and Touch PCB interrupted
PCB temperature sensor is open
Partition inserted or removed while oven is operating