How do I fix error code C-21 on a Samsung ovens & ranges?

1. undefined: Disconnect power and disconnect sensor harness from sensor 2. undefined: Measure sensor resistance (normal 1080 ohms at room temp) 3. undefined: Check resistance of broil, bake and convection heater elements 4. undefined: Check DLB, broil, bake and convection relay operation 5. undefined: Check wire harness for disconnection on Main PCB 6. undefined: Measure resistance of oven sensor connector on main pcb (normal 2850 ohms) 7. undefined: Replace Main PCB if temperature remains high during operation

Samsung Ovens & Ranges

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

This Error Applies To

Samsung NV51K7770S Series Ovens & Ranges

Service manual exact match: NV51M9970SSService manual exact match: NV51K7770SSService manual exact match: NV51M9770SService manual exact match: NV51K7770S