Samsung Range Error Code E-21

E-21 on a Samsung range means the oven temperature sensor has an open resistance fault, indicating the sensor's resistance has risen beyond the acceptable limit or lost continuity entirely. The control board uses this sensor to monitor oven temperature during cooking, and when it detects an abnormal reading, it displays E-21 and disables oven operation. The most likely cause is a worn-out sensor probe, though damaged wiring can produce the same code.

You should not attempt to use the oven while E-21 is active. Because the control board cannot accurately read oven temperature, it cannot regulate heating properly, which creates a risk of overheating or inconsistent cooking temperatures. The oven baking and broiling functions should be considered unreliable until the sensor fault is resolved. Surface burners may still operate normally depending on your model.

Disconnecting power to the range for a few minutes may temporarily clear the E-21 code, but it will return as soon as the control board checks the sensor again and detects the abnormal resistance. A reset does not repair a failed sensor or damaged wiring. The only way to permanently clear E-21 is to correct the underlying fault, which typically means replacing the oven temperature sensor or repairing the wiring.

Many technicians and experienced DIYers can resolve E-21 by replacing the oven temperature sensor, which is one of the more straightforward oven repairs. The process involves disconnecting power, removing the upper rear cover panel, measuring sensor resistance with a multimeter to confirm the fault, and swapping in a new sensor. If the sensor measures correctly and wiring checks out, the repair becomes more complex and may require professional diagnosis of the control board.

If only the oven temperature sensor needs replacement, parts typically run in the range of $20 to $60 depending on the specific Samsung model, making it a relatively affordable repair. If you hire a technician, expect to pay an additional $75 to $150 or more in labor. If the control board is at fault, board replacement costs are considerably higher, often ranging from $150 to $350 or more for the part alone.