In brief
F4E4 points at the humidity thermistor or the wiring connected to it. Until it is fixed, avoid steam and sensor-guided cooking modes; if a plain mode runs without the code, attended use is reasonable.
Error codes
Reference| Code | Meaning |
|---|---|
| F4E4 | There may be a problem with the Humidity Thermistor or the associated wiring. |
What you will notice
- Steam or sensor modes cancel with the code — Functions that rely on moisture readings stop or refuse to start.
- The code follows a steam cook — Moisture around the part or its connector is part of the picture.
- Sensor cooking finishes too early or too late — Before the code appears, sensor-timed cooking can misjudge doneness.
- Plain modes may still run — On some models only the moisture-guided functions depend on this part.
- NEAR MISS: a water filter or water sensor code — Codes naming the water filter or the water conductivity sensor concern the water supply, not humidity sensing.
Likely causes, ranked
- Moisture in its connector — Ranked first when F4E4 follows heavy steam use or a cleaning with water: moisture condensed in a connector corrodes or bridges it, and the reading fails until it dries.
- The humidity thermistor — Named in the documented meaning; it lives in steam and cooking vapor, which coat and wear sensing parts.
- Its wiring — Leads near the cavity harden with heat and can crack where they bend.
- The control reading it — Last, after the part and its wiring test good.
Check in this order
- Let the cavity dry — With the door ajar and the unit off, let all moisture clear before retesting.
- Reset once — Reset at the breaker after drying out.
- Compare plain and steam modes — Note which modes raise the code; plain modes working narrows it to the moisture side.
- Sensor test — Measuring the part and its wiring is technician work.
Reset and owner-safe checks
- Dry the cavity — Wipe the cavity, then leave the door ajar and the unit off for an hour so moisture clears.
Tools: soft clothAbout 60 min
- Reset at the breaker — Breaker off for a few minutes, then on.
About 5 min
- Try a plain mode — Run a short plain bake and see whether it works without the code.
About 10 min
- Stop here if the next check needs a meter — Testing a part or its wiring means live terminals or disassembly, which is technician work.
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. Steam can scald: let the cavity cool and vent before opening it wide or wiping it, and keep water away from the control area. Let the cavity and any surface units cool fully before reaching in or behind them.
When it is a service call
Call for service if F4E4 returns after the cavity has dried out and the unit has been reset, or if plain modes stop working too. The humidity thermistor and its connector sit behind cavity panels. If more than one code appears at once, report them together; codes raised in a group often share one cause.
Neighboring Jenn-Air oven codes
Generalized information
What this covers: F4E4 as Jenn-Air documents it for Jenn-Air ovens with steam or sensor-guided functions whose code list carries F4E4. What it does not cover: ovens without moisture sensing, water filter and water sensor codes, and models that read F4E4 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.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
