What the code means
F3H 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 |
|---|---|
| F3H | There may be a problem with the Humidity Thermistor or the associated wiring. |
What you observe
- Plain modes may still run — On some models only the moisture-guided functions depend on this part.
- Sensor cooking finishes too early or too late — Before the code appears, sensor-timed cooking can misjudge doneness.
- The code follows a steam cook — Moisture around the part or its connector is part of the picture.
- Steam or sensor modes cancel with the code — Functions that rely on moisture readings stop or refuse to start.
- 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.
What triggers the code, in likelihood order
- The humidity thermistor — Ranked first when F3H is steady from a cold start: a humidity thermistor that has failed reads wrong before any steam is involved.
- Moisture in its connector — Steam that condenses at a connector can corrode or bridge it.
- 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
- 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.
- Let the cavity dry — With the door ajar and the unit off, let all moisture clear before retesting.
- Sensor test — Measuring the part and its wiring is technician work.
Reset and owner-safe checks
- 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
- 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
- Stop here if the next check needs a meter — Testing a part or its wiring means live terminals or disassembly, which is technician work.
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. 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 to call a technician
Call for service if F3H 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. Mention any recent work on the kitchen wiring, a new breaker or a power outage; supply changes are part of the diagnosis.
Nearby codes on the same oven line
Generalized information
This is the generalized reading of F3H across the Jenn-Air oven line. It applies to Jenn-Air ovens with steam or sensor-guided functions whose code list carries F3H. It does not apply to ovens without moisture sensing, water filter and water sensor codes, and models that read F3H differently, and the same characters can mean something else on another brand. Where a model-specific page exists for your model line, it is the more specific answer and comes first.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
