Samsung Ovens & Ranges2019–present
Error Code C-21
Oven heating over - Temperature rising too fast or sensor shorted
Moderate
Address soon - your appliance may not work properly
What This Means
Oven sensor shorted; Defective heater relay; Heater continuously on; Damaged main PCB pattern
How to Fix
- 1
Disconnect power and open back cover
- 2
Disconnect sensor harness from control
- 3
Measure sensor resistance (should read 25-1000 ohms at room temp)
- 4
Check broil, bake, and convection heaters for resistance
- 5
Check if DLB of sub PCB, Broil, Bake and Convection heater relays working normally
- 6
Check for disconnection of harness linked with main PCB
- 7
Measure resistance of oven sensor connector on main PCB
- 8
Replace main PCB if relay damaged or pattern cracked
This Error Applies To
Samsung NE59J3420S Series Ovens & Ranges (2019) (2019–present)
Service manual exact match: NE59*432***Service manual exact match: NE59J3420SSService manual exact match: NE59M3420SSService manual exact match: NE59J3421Service manual exact match: NE59J3421SS