The short answer
The documented reading of F3 E8 is a fault in the lower oven temperature sensor, the control or their wiring. A power cycle is worth one try; if the code returns, leave the lower oven off until the sensor circuit has been measured.
Error codes
Reference| Code | Meaning |
|---|---|
| F3 E8 | There may be a problem with the Lower Oven Temperature Sensor, the Control, or the associated wiring. |
What you will notice
- The code first appeared after a self-clean — The oven worked before the clean cycle and has raised the code since.
- Preheat overshoots or never finishes — A sensor reading wrong makes the control heat too long or stop too soon.
- 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.
What triggers the code, in likelihood order
- Sensor wiring damaged by heat or pinching — Ranked first when F3 E8 first appeared after a self-clean: the clean cycle runs the cavity far hotter than baking, and the sensor's wiring and connector take the brunt of it.
- A failed or drifting lower oven temperature sensor — A sensor that reads wrong, or not at all, is the most direct way to produce this code, and it is a part that wears.
- The sensor connector behind the oven — The sensor plugs into the harness at the back wall; a connector pulled half off, corroded or heat-darkened breaks the reading.
Check in this order
- Check what came before — A code that started after a self-clean or after the range was moved points at heat or pinch damage to the sensor wiring.
- 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
- Reset the control — Switch the oven off at the breaker for a few minutes, then back on.
About 5 min
- Record when it happens — Note whether the code appears at preheat, mid-bake or after a clean; it decides the order of a technician's tests.
Tools: notebook or phoneAbout 2 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.
Safety first
Safety
Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off. The sensor probe sits inside a cavity that stays hot long after cooking, and its connector is behind the oven next to live terminals; inspect only the visible probe, with the oven cool and off at the breaker.
Reset or service call?
Once the probe looks sound and F3 E8 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.
Neighboring Jenn-Air oven codes
Scope of this code reading
Generalized information: F3 E8 is read here for the Jenn-Air oven line as a whole, which fits the lower oven of Jenn-Air double ovens whose code list carries F3 E8 as a temperature-sensor fault. It is not a reading for meat-probe codes, microwave and cooktop sensor codes, and models that read F3 E8 differently. Model lines can reuse a code with another meaning, so a model-specific page, where one exists, comes first.
Related Jenn-Air oven codes
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