Samsung Oven Error Code C-21

C-21Samsung Oven

What this code means

Oven heating over - oven temperature has exceeded safe limits.

First step from the service manual

Disconnect power. Open the back cover. Disconnect sensor harness from control. Measure sensor resistance: 1080 ohms at room temperature. If abnormal, replace oven sensor.

Next steps: diagnose the root cause

1
Verify the error code is active

Power cycle the unit and see if the code returns. If it does, the fault is persistent and requires diagnosis.

2
Get the full diagnostic procedure

Get step-by-step guidance, test values, and wiring diagrams from the OEM service manual.

Start diagnosing C-21 on your Samsung oven

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What’s available for Samsung oven models

Access Samsung oven service manuals, wiring schematics, exploded parts views, and error code references on MyPros+.

Related Samsung oven error codes

-dC-Partition is inserted or removed while the oven is operating.C-10Gas sensor is open or shorted when the speed convection oven is operating in…C-20Oven sensor open (over 2950 ohms) or oven sensor short (under 930 ohms).C-22Oven sensor is shorted when the oven is operating.C-23Internal temperature rises abnormally high during oven operation.C-24Temperature probe sensor is shorted when oven is operating.C-30PCB temp sensor is open or shorted when the oven is operating.C-31Safety errorC-32PCB temp sensor is shorted when the oven is operating.C-33PCB temperature rises abnormally high.C-41Steam sensor is open when the steam mode is on.C-42Steam sensor is shorted when the steam mode is on.C-51Drain system related problem; occurs when water level sensor senses water…C-70The steam sensor is open or short when the steam mode is operating.C-72Drain system problem occurs when water level sensor senses water remaining…C-A2Cooling motor is operating abnormally.C-d0Key short errorC-d1Door lock cannot find correct position for over 1 minute.C-d5Door lock is mispositioned.C-F0Communication between the Main and Sub PCB is interrupted.CA-1Cooling motor is operating abnormally.Cd-2Door lock is mispositioned.CF-1Communication between the Main and Sub PCB is interrupted.CF-2Communication between the Main and Touch PCB is interrupted.E-08Oven fails to reach 100°F (38°C) within 10 minutes from room temperature…FSelf-clean mode malfunction; oven is malfunctioning in the self-clean mode.H-3Self-diagnosis error for Lower Bake heater (Lower Oven Only).H-4Self-diagnosis error for Lower Broil heater (Lower Oven Only).
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