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Samsung Ovens & Ranges2017–present

Error Code C-31

PCB overheating - internal temperature critically high

Critical

Stop using immediately - risk of damage or safety issue

Also displayed as: C-31

What This Means

Poor ventilation around main PCB; Convection cooling fan not operating; Dust accumulation blocking PCB airflow

What actually causes this:

Cooling fan not running, dust blocking ventilation, or inadequate heat dissipation

First Thing to Check

Check that cooling fan is running when oven is in use

Parts Involved

Main PCBCooling FanPCB Vents

How to Fix

  1. 1

    Check cooling fan operation

  2. 2

    Verify PCB ventilation slots are clear of dust

  3. 3

    Inspect for adequate airflow around PCB area

This Error Applies To

Samsung DOB30M977 Series Ovens & Ranges (2017) (2017–present)

Service manual exact match: DOB30M977DService manual exact match: DOB30M977S

Related Error Codes

C-F2

Touch panel control communication failure

C-30

PCB temperature sensor open or short circuit

C-A2

Cooling fan motor malfunction

C-20

Oven temperature sensor circuit is open

C-21

Oven overheating - internal temperature critically high

C-23

Meat probe sensor short circuit detected

C-72

Steam drain system not working - water remains after cycle

C-d1

Door lock mispositioned or malfunctioning

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