Jenn-Air Oven Error Code F3

The F3 code means the control board detected the cooling fan operating when no oven function was selected. This points to a problem with the oven temperature sensor, the wire harness connecting it to the board, or in less common cases, the control board itself. Ohm-testing the sensor and visually inspecting the harness are the correct first steps.

Using the oven with an active F3 code is not recommended. The fault indicates the control board cannot accurately track cooling fan operation relative to oven status, which means temperature monitoring may not be reliable. Running the oven in this condition risks undetected overheating or inaccurate cooking temperatures. Diagnose and resolve the fault before resuming normal use.

Unplug the oven from power before testing. Locate the temperature sensor inside the oven cavity, usually a thin probe on the back wall secured with one or two screws. Disconnect its wiring connector and set a multimeter to measure ohms. A properly functioning sensor reads approximately 1080 ohms at 70 degrees Fahrenheit. A reading significantly above or below this range, or an open circuit reading, confirms the sensor is faulty and needs replacement.

Start by unplugging the oven and locating the temperature sensor, typically mounted inside the oven cavity on the rear wall. Disconnect the sensor and use a multimeter to check its resistance, which should read around 1080 ohms at room temperature for most Jenn-Air models. If the sensor is out of range, replace it. If it tests correctly, inspect the wire harness from the sensor to the control board for damage, corrosion, or loose connectors. If both components check out, the control board may need replacement.

If the fix is a temperature sensor replacement, parts typically run between $20 and $60 depending on the model, and a homeowner comfortable with basic appliance repair can handle it in under 30 minutes. A wire harness repair may cost similar amounts in parts. Control board replacement is significantly more expensive, often $150 to $350 or more for the part alone, and professional installation adds labor costs. Getting a technician diagnosis first is worthwhile before committing to a board replacement.