Samsung Oven C-23 Error Code — What It Means
The C-23 error code on Samsung Dual Cook and wall oven models indicates a sensor malfunction related to temperature sensing. This code falls within the C-20 through C-23 range, all of which point to faults in the oven’s temperature-sensing circuit. The control board is reporting that it cannot get a valid reading from the oven thermistor or that the signal is intermittent or out of range. Samsung does not list C-23 in all general oven code tables, so check your specific model’s documentation to confirm interpretation. In most cases, the fault lies with the temperature sensor itself, its wiring harness, or the connector between the sensor and the control board. Less often, the main control board may fail to read a good sensor correctly.
Common Causes
- Failed oven temperature sensor The thermistor inside the oven cavity has drifted out of specification or failed open or shorted, preventing accurate temperature readings.
- Loose or corroded sensor connector The plug where the sensor harness meets the control board or the sensor itself has worked loose, corroded, or developed a high-resistance contact.
- Damaged sensor wiring The wire harness running from the sensor to the control has been pinched, burned by oven heat, or chewed, causing an open circuit or intermittent short.
- Control board reading fault The electronic control board’s sensor input circuit has failed even though the sensor and harness test within normal range.
- Temporary glitch or firmware hiccup A power surge or brief electrical anomaly caused the control to log a false sensor fault that will clear after a reset.
Step-by-Step Fix
- Power off the oven completely by unplugging it or switching off its dedicated circuit breaker at the panel, then wait at least 30 seconds to allow the control board to reset. Restore power and check whether the C-23 code returns during the next heating cycle.
- Locate the oven temperature sensor, which is typically a metal probe extending into the rear wall of the oven cavity. Unplug the oven again, then trace the sensor’s wire harness back to its connector at the control board.
- Inspect the sensor connector and terminals for corrosion, charring, or looseness. Disconnect the plug, examine both the male and female pins, and clean any oxidation with electrical contact cleaner or a small wire brush. Push the connector firmly back together.
- Measure the sensor’s resistance using a digital multimeter set to ohms. Disconnect the sensor from the harness and place probes on the sensor’s terminals. Consult your model’s service manual for the correct resistance at room temperature. If the reading is open (infinite resistance), shorted (zero or near-zero ohms), or far outside the expected range, replace the sensor.
- Check harness continuity by testing each wire from the sensor connector back to the control board for breaks or shorts to ground. Look for pinched insulation behind the control panel or near oven vents where heat can damage wiring.
- Replace the temperature sensor if testing confirms it is out of specification or if the connector shows signs of heat damage that cannot be cleaned. Match the replacement to your oven’s model number.
- Verify the repair by reassembling the oven, restoring power, and running a bake cycle at 350°F for 15 minutes. Monitor the display to confirm the C-23 code does not return and that the oven heats to the set temperature. If the code reappears despite a new sensor and good wiring, the control board may need replacement.
Parts Often Needed
| Part | Notes |
|---|---|
| Oven temperature sensor / thermistor assembly | Amazon | Match the part number to your exact Samsung oven model. The sensor usually includes a short pigtail harness and mounting bracket. |
| Sensor wire harness | Amazon | Order if the existing harness shows heat damage, cuts, or melted insulation that cannot be safely repaired with connectors. |
| Main control board / electronic control board | Amazon | Required only if the sensor and wiring test good but the C-23 code persists. Verify your model and serial number before ordering. |
When to Call a Pro
Call a qualified appliance technician if the C-23 code returns after you have reset the oven and checked the sensor connector, if you are uncomfortable working with live electrical circuits or reading resistance values with a multimeter, or if you have replaced the sensor and verified all wiring but the fault persists. Control board diagnosis and replacement require access to model-specific schematics and calibration procedures that are best handled by a trained technician. Also contact Samsung support or a pro if your oven is still under warranty, since DIY sensor replacement may void coverage on some models.