Error Code C-21
Internal temperature rises abnormally high — safety error
Moderate
Address soon - your appliance may not work properly
What This Means
Oven sensor resistance out of spec; DLB/Broil/Bake/Convection relays on Main PCB not working normally; Wire harness on Main PCB disconnected; Oven sensor connector resistance abnormal
How to Fix
- 1
Disconnect power, open back cover, disconnect sensor harness from sensor
- 2
Measure sensor resistance at room temperature — spec value approximately 1100 ohms
- 3
Replace oven sensor if out of spec
- 4
Check resistance of broil, bake, and convection heater
- 5
Check whether DLB broil, bake, and convection relays on Main PCB are working normally
- 6
Check whether any part of wire harness on Main PCB is disconnected
- 7
Unit will display C-21 after beeping 3 times if temperature is higher than spec during operation
Other Error Codes for NEK55AC
Oven sensor is open when the oven is operating
Key short circuit — keypad short detected on Sub PCB
Communication between Main PCB and Touch PCB is interrupted
PCB temp sensor is short when oven is operating
Door lock is mispositioned — door lock motor or switch fault during self-clean
PCB temperature rises abnormally high
Communication between Main PCB and Sub PCB is interrupted
PCB temp sensor is open when oven is operating