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Samsung Ovens & Ranges2020–present

Error Code C-21

Internal temperature rises abnormally high

Moderate

Address soon - your appliance may not work properly

What This Means

Sensor resistance incorrect; Broil, bake or convection heater failure; Relay malfunction; Wire harness disconnected; Sensor connector resistance incorrect

How to Fix

  1. 1

    Disconnect power. Disconnect sensor harness from sensor. Measure sensor resistance: 1080Ω at room temperature

  2. 2

    Check the resistance of broil, bake and convection heater

  3. 3

    Check whether DLB, broil, bake and convection relays on Main PCB are working normally

  4. 4

    Check whether any part of wire harness on Main PCB is disconnected

  5. 5

    Check the resistance of oven sensor connector on main PCB (Normal: 2850Ω)

This Error Applies To

Samsung NV51K6650 Series Ovens & Ranges (2020) (2020–present)

Service manual exact match: NV51K6650S*Service manual exact match: NV51K6650D*

Related Error Codes

C-23

Temp probe sensor is shorted when oven is operating

C-30

PCB temp sensor is open or shorted when oven is operating

C-31

PCB temperature rises abnormally high

C-70

Steam sensor is open or shorted when steam mode is on

C-72

Drain system problem - Water level sensor senses water remaining after maximum draining time

C-A2

Cooling motor is operating abnormally

C-d1

Door lock is mispositioned

C-d0

Keys are shorted

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