Error Code C-21

Oven overheating - oven temperature sensor detects excessive heat or heating elements are stuck on

What This Means

Defective oven temperature sensor; Faulty DLB (Double Line Break) relay on PCB; Faulty broil heater relay on PCB; Faulty bake heater relay on PCB; Faulty convection heater relay on PCB; Disconnected or damaged harness to main PCB; Short circuit in heater wiring

How to Fix

1. 1

   Disconnect power and the Assy Display PCB

2. 2

   Check the DLB relay TB201 (1,2-3,4) — normal resistance is infinity (open) when de-energized

3. 3

   Check broil relay TB204 (1,2-3,4) — normal resistance is infinity when de-energized

4. 4

   Check bake relay TB207 (1,2-3,4) — normal resistance is infinity when de-energized

5. 5

   Check for damaged PCB pattern

6. 6

   Check connector and harness connected to CNS600 on main PCB for proper seating and damage

7. 7

   Measure oven sensor resistance: normal is 1080 ohms at room temperature

8. 8

   If sensor and harness check out, replace main PCB

This Error Applies To

Samsung NX60T8711 Series Ovens & Ranges (2023) (2023–present)