Short answer first
Jenn-Air documents F3 E9 as a possible problem with the lower oven temperature sensor, the control or the associated wiring. The sensor tells the control how hot the lower oven is; without a reading it can trust, the control usually stops heating. Do not use the lower oven until the code is cleared and stays clear.
Error codes
Reference| Code | Meaning |
|---|---|
| F3 E9 | There may be a problem with the Lower Oven Temperature Sensor, the Control, or the associated wiring. |
What you will notice
- Food burned or undercooked before the code — Results went wrong for a while, and the code showed up later.
- The oven stops heating and shows the code — Without a sensor reading it trusts, the control cancels the heat rather than guess.
- NEAR MISS: the cavity never warms at all — No heat and no sensor code points at the heating element or its supply, a different fault.
Causes, most likely first
- The lower oven temperature sensor itself — Ranked first when F3 E9 comes after temperatures that wandered: a sensor drifting out of range reads wrong before it fails outright, and the control regulates to the wrong reading.
- A probe knocked toward the cavity wall — Inside the oven the probe should stand clear of the wall; one bent against it by a rack reads the wall rather than the air.
- The control reading the sensor — Named in the documented meaning, but concluded last: it is replaced only after the sensor and its wiring measure good.
Diagnostic order, cheapest and safest first
- Compare with an oven thermometer — If the oven still heats, a separate thermometer shows whether it is regulating far off its setting.
- Look at the probe in the cavity — With the oven cool, find the probe near the top rear of the cavity and check it stands clear of the wall and is not bent or loose.
- Reset and note the timing — Power-cycle at the breaker, preheat once, and note whether the code returns at once or only when hot.
Clearing the code and safe checks
- Run a thermometer check — If the oven will still heat, place an oven thermometer in the center and compare it with the setting once the oven has settled.
Tools: oven-safe thermometerAbout 30 min
- Inspect the sensor probe — With the oven cool and off at the breaker, look at the probe at the top rear of the cavity; if it has been knocked toward the wall, note it for the technician rather than bending it.
Tools: flashlightAbout 5 min
- Stop before any panel comes off — Everything past this point needs live measurements or a panel removed; that is the line between an owner check and a service call.
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off. An oven that keeps heating with a sensor code can overheat; if that happens, switch it off at the breaker rather than at the panel.
When to call a technician
Once the probe looks sound and F3 E9 still returns, book a technician to measure the sensor, its connector behind the oven and the control input. Keep the lower oven off at the breaker if it ever heats with the code displayed.
Nearby codes on the same oven line
What this reading does not cover
What this covers: F3 E9 as Jenn-Air documents it for the lower oven of Jenn-Air double ovens whose code list carries F3 E9 as a temperature-sensor fault. What it does not cover: meat-probe codes, microwave and cooktop sensor codes, and models that read F3 E9 differently, or the wiring colors, part numbers and test values of any one model. A model-specific page for your unit, where one exists, outranks this general reading. A second Jenn-Air listing spaces this code differently and words it differently; confirm which one fits your model.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
