Error Code C-21
Oven heating over - temperature exceeds safe limits
Moderate
Address soon - your appliance may not work properly
What This Means
Defective oven temperature sensor; Faulty heater relay; Shorted heating element; Incorrect divider switch position; Defective Main PCB
How to Fix
- 1
Disconnect power and open back cover
- 2
Measure oven sensor resistance: 1080Ω at room temperature
- 3
Check resistance of broil, bake, and convection heaters
- 4
Check DLB, broil, bake, and convection heater relays
- 5
Verify all connectors on Main PCB are plugged in correctly
- 6
Check oven sensor connector resistance on Main PCB (Normal: 2850Ω)
- 7
Check divider switch is in OFF position with divider inserted
Other Error Codes for NX58K7850SG
Shorted key - Keypad malfunction
PCB temperature too high - Safety error
Oven sensor opened (over 2950Ω) or shorted (under 930Ω)
PCB sensor opened or shorted - Oven sensor error
Door lock malfunction - Lock motor or switch error
Main to Sub PCB communication error - Continuous communication failure between Main PCB and Sub display/fan control PCB
Main to Touch PCB communication error - Communication failure between Main PCB and Touch control panel
BLDC motor operation error - Cooling fan or air intake motor malfunction