Frigidaire Range Error Code 1d21

The 1d21 code indicates a runaway temperature fault that occurs when the oven temperature reaches 950 degrees Fahrenheit during a self-clean cycle while the door is locked. At that temperature, the RTD sensor resistance exceeds 2787 Ohms, triggering the fault. The control board responds by canceling the active cook function, disabling all cooking functions for the cavity, and flashing BAKE on the display. The oven door remains locked until the cavity temperature drops to a safe level.

Disconnecting power to the range for a few minutes may clear the code temporarily and restore cook functions, but the fault will return if the underlying problem is not repaired. The control board canceled cooking and flashed the error because it detected a specific resistance threshold being exceeded, which points to a real component issue. A reset alone is not a fix and should only be used as part of a broader diagnostic process.

Repair costs vary depending on the failed component. An RTD temperature sensor typically costs between 20 and 60 dollars for the part, while a replacement electronic control board can range from 150 to 350 dollars or more depending on the model. If you hire a technician, labor charges generally add 80 to 150 dollars per hour. Diagnosing the exact cause before ordering parts is strongly recommended to avoid unnecessary expense.

You should not attempt to use the oven again until the underlying cause has been diagnosed and corrected. The fault indicates the oven reached an unsafe temperature threshold, and using it again before the sensor, wiring, or control board is inspected could result in repeated overheating. Keep the oven powered off and allow it to cool fully before beginning any diagnostics.

Start by allowing the oven to cool completely, then check the RTD sensor resistance with a multimeter and inspect the sensor wiring harness for damage or loose connections at both the sensor and control board ends. If the sensor resistance is out of specification or the wiring shows damage, those components should be replaced. If the sensor and wiring are intact, the control board relay may be stuck, requiring board replacement.