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Samsung Ovens & Ranges2020–present

Error Code C-31

Safety interlock triggered - excessive temperature detected

Critical

Stop using immediately - risk of damage or safety issue

Also displayed as: C-31

What This Means

NTC sensor malfunction; Faulty heater relay; Stuck relay contacts; PCB circuit pattern damage

What actually causes this:

Defective temperature sensor or stuck heater relay causing continuous heating

First Thing to Check

Check NTC200 sensor resistance (3200Ω at room temperature); check relay function

Parts Involved

NTC200 thermistorBroil heater relayBake heater relayMain PCB

How to Fix

  1. 1

    Disconnect power and open back cover

  2. 2

    Check NTC200 sensor status for breaks or soldering issues

  3. 3

    Check heater relay resistances at positions 1-2 and 2-3

  4. 4

    Check for open or short conditions in relay circuits

  5. 5

    Inspect PCB for damaged pattern or components

This Error Applies To

Samsung NV51M9770S Series Ovens & Ranges (2020) (2020–present)

Service manual exact match: NV51M9770SSService manual exact match: DOB30P977SS

Related Error Codes

C-F2

Display/touch panel communication failure

C-21

Oven temperature control failure - overheating

C-23

Temperature probe circuit fault

C-70

Steam generation temperature sensor circuit open

C-d0

Keypad control circuit short circuit

C-72

Steam drain pump circuit malfunction

C-20

Oven temperature sensor malfunction

C-A2

Cooling fan motor circuit malfunction

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