Electrolux Range Error Code C-21

C-21 indicates an open circuit has been detected in the oven temperature sensor circuit. The control board is not receiving any signal from the sensor probe inside the oven cavity. Because the oven cannot monitor its temperature, it shuts down and displays this code as a safety measure. The fault can be caused by a loose connector, a broken wire, or a failed sensor.

No, the oven should not be used while C-21 is active. The control board cannot read the oven temperature, so it has no way to maintain safe and accurate heat levels. Attempting to operate the oven in this condition could result in overheating or uncontrolled temperature swings. The fault should be diagnosed and repaired before resuming use.

If only a connector needs to be reseated, there may be no parts cost at all, though a service call fee typically applies for a technician visit. Replacing an oven temperature sensor is generally a lower-cost repair, with parts in the range of $20 to $80 depending on the model. If the main control board is the cause, total repair costs including parts and labor can range from $150 to $400 or more.

A homeowner comfortable with basic appliance work can start by checking that both wiring connectors in the sensor circuit are firmly seated, since a loose connection is the most common cause. If the connectors look secure, testing the sensor with a multimeter requires some technical knowledge but is a straightforward continuity check. Wiring harness repairs or main board replacement are generally best left to a qualified technician.

Powering the range off at the circuit breaker for a few minutes may temporarily clear the code, but if the underlying fault in the sensor circuit is still present, C-21 will return as soon as the oven attempts to operate. A reset is useful for confirming whether the fault is intermittent, but it is not a fix. The wiring and sensor must be inspected to resolve the issue permanently.