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Samsung Ovens & Ranges

Error Code C-21

Oven heating over - abnormal temperature rise

Moderate

Address soon - your appliance may not work properly

What This Means

Oven sensor failure; Heater element failure; Main PCB malfunction; Relay failure (DLB, Broil, Bake, Convection)

How to Fix

  1. 1

    Disconnect power and open back cover

  2. 2

    Measure sensor resistance (normal: 1080Ω)

  3. 3

    Check broil, bake, and convection heater resistance

  4. 4

    Check DLB and relay operation on sub PCB

  5. 5

    Verify harness connections to main PCB

  6. 6

    Check oven sensor connector resistance (normal: 2850Ω)

  7. 7

    Replace or repair harness if disconnected

  8. 8

    Replace main PCB if all tests fail

This Error Applies To

Samsung NE63T8951 Series Ovens & Ranges

Service manual exact match: NE63T8951

Related Error Codes

C2

IGBT sensor open or short circuit

C-20

Oven sensor opened (over 2950Ω) or oven sensor shorted (under 930Ω)

C-22

Sub PCB sensor open circuit

C-23

Temperature probe sensor short circuit

C-30

Main PCB sensor open circuit

-dC-

Divider inserted or removed while oven operating

bAd LInE

Power cord installed improperly

C-A2

Sub PCB temperature abnormally high

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