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Error code reference

Jenn-Air Oven Error Code F3

Shorted key detected (stuck function key on control).

Jenn-Air codesJenn-Air oven codes

Shorted key detected (stuck function key on control).

First step from the service manual

Check for stuck function key on control.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What F3 means on a Jenn-Air oven

The F3 error on a Jenn-Air oven indicates the control board has detected the cooling fan running without any oven function being active. The control board continuously monitors the relationship between fan operation and oven mode selection. When the fan operates outside of an active cook or broil cycle, the board flags this as a fault condition. The first diagnostic step is to ohm-test the sensor and inspect the wire harness connecting the sensor to the control board, which points to a temperature sensor or wiring issue as the root cause.

For homeowners, this code essentially means your oven's cooling fan is spinning when it should not be, and the oven's brain has caught this mismatch and thrown a fault. The cooling fan is designed to run during and after cooking cycles to protect internal electronics from heat. If the sensor that tells the board the oven is cool is sending a bad reading, the board may think the oven is still hot and keep the fan running unnecessarily. A broken sensor, damaged wiring, or a failed control board can all produce this condition.

This code does not necessarily mean the oven is in immediate danger, but continued operation without diagnosing the root cause can mask real temperature problems or lead to premature component failure.

Source: manufacturer service documentation.

Common causes of F3

  1. 01

    Faulty oven temperature sensor

    Part replacement

    A failing or out-of-range temperature sensor can send incorrect resistance readings to the control board, causing the board to misread oven conditions and keep the cooling fan active. Ohm-testing the sensor is the first recommended step because this is the most frequent cause of F3.

  2. 02

    Damaged or shorted wire harness to sensor

    Part replacement

    If the wiring harness between the temperature sensor and the control board is pinched, corroded, or has shorted wires, the control board receives erroneous signals that can trigger the cooling fan without an active oven function. Inspecting the harness for visible damage or measuring continuity can confirm this cause.

  3. 03

    Failed control board

    Part replacement

    If the sensor and harness both test within spec, the control board itself may have a failed relay or internal fault that is incorrectly activating the cooling fan circuit. This is a less common cause but should be considered after the sensor and wiring are ruled out.

See the test procedure for each cause

Frequently asked questions about F3

What does the F3 error code mean on a Jenn-Air oven?
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.
How do I fix the F3 error code on a Jenn-Air oven?
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.
Can I still use my Jenn-Air oven with an F3 error code active?
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.
How much does it cost to fix an F3 error on a Jenn-Air oven?
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.
How do I test the temperature sensor to diagnose F3 on my Jenn-Air oven?
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.

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