Samsung Oven Error Code C-20

C-20 on a Samsung oven means the control board has detected an abnormal resistance reading from the oven temperature sensor. The sensor circuit must read between 930 and 2950 ohms to be considered valid, with a correct reading of approximately 1080 ohms at room temperature. A reading outside that range indicates either an open circuit (above 2950 ohms) or a short circuit (below 930 ohms). The oven disables heating when this fault is active because it cannot safely regulate temperature.

You should not use the oven while C-20 is active. Because the temperature sensor is not providing a valid reading, the control board cannot accurately regulate oven temperature. Using the oven in this condition creates a risk of overheating or unpredictable heating behavior. Leave the oven off until the sensor fault is diagnosed and repaired.

If the oven temperature sensor is at fault, the part typically costs between $20 and $60 depending on the specific model. Professional labor for sensor replacement generally adds $80 to $150 to the total repair cost. If the control board requires replacement, parts alone can range from $100 to $300 or more, making that a significantly more expensive repair.

A knowledgeable DIYer can diagnose and fix this error by disconnecting power, removing the back cover, and using a multimeter to measure resistance at the sensor harness connector. If the sensor reads outside the normal range, replacing the oven temperature sensor is a straightforward repair that typically involves removing a couple of mounting screws inside the oven cavity and unplugging the harness. If the sensor reads correctly, further diagnosis of the wiring harness and connectors is needed before considering control board replacement.

Resetting the oven by disconnecting power for a few minutes may temporarily clear the display, but the C-20 code will return as soon as the control board re-reads the faulty sensor signal. A reset does not fix the underlying sensor or wiring problem. Permanent resolution requires measuring and replacing the faulty component.