Samsung Range Error Code C-20

C-20 indicates the oven temperature sensor circuit has gone outside its acceptable resistance range. The control board expects a sensor resistance between 930 and 2950 ohms, with a nominal reading of approximately 1080 ohms at room temperature. When the reading falls outside that window due to an open or short circuit, the range displays C-20 and disables oven operation. The fault is most commonly caused by a defective sensor probe or a damaged wiring harness.

No. The C-20 error disables the oven because the control board cannot accurately monitor temperature without a functioning sensor. Running the oven in this condition risks uncontrolled overheating or unpredictable temperature behavior. The stovetop burners are generally unaffected by this error, but the oven should not be used until the sensor circuit is repaired.

If the oven temperature sensor is the cause, the part itself typically costs in the range of $20 to $60 depending on the specific Samsung model. Professional labor to diagnose and replace the sensor generally adds $100 to $200. If the control board turns out to be faulty instead of the sensor, board replacement can cost between $150 and $350 for the part alone, making professional diagnosis worthwhile before purchasing components.

A knowledgeable DIYer can diagnose and often repair C-20 by disconnecting power, removing the rear cover, disconnecting the sensor harness from the control module, and measuring sensor resistance with a multimeter. If the resistance is not near 1080 ohms at room temperature, the sensor needs to be replaced. The sensor is typically secured with two screws inside the oven cavity and is a straightforward replacement for someone comfortable working on appliances.

A power reset by unplugging the range or turning off the circuit breaker for a few minutes may temporarily clear the error code display, but C-20 will return as soon as the control board re-checks the sensor circuit. Because the fault is a hardware issue with the sensor or its wiring, it cannot be permanently resolved through a reset alone. The underlying sensor or wiring fault must be corrected.