JennAir Combination Wall Oven Code F4 E4: humidity sensor in the microwave

What F4 E4 means

On JennAir combination wall ovens with a microwave, F4 E4 reports a possible problem with the microwave humidity sensor, the microwave appliance manager, or the wiring. The humidity sensor helps the sensor-cooking functions judge doneness. You will see F4 E4 on the screen, and sensor-based microwave cooking may not work. Automatic sensor programs, such as reheat or popcorn, will not work while the code shows. Timed cooking may still run.

Common causes of F4 E4

Microwave humidity sensor not reporting properly
Appliance manager misreading the humidity signal
Wiring to the sensor that is loose or damaged

✓ One safe check you can try

1. Press Cancel and wipe the microwave cavity dry. 2. Open the door and let the cavity air out for a few minutes. 3. Shut off the circuit breaker for a minute, then reconnect power and see if the humidity sensor check passes. 4. Try a basic timed microwave run with water. 5. If the display shows F4 E4 once more, phone us and we will test the humidity sensor.

! Why to stop there

Steam and moisture can affect the sensor, but only a test shows if it has failed.
The humidity sensor is inside the microwave section and needs careful access.
Swapping the manager board first could leave the true cause in place.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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Other Wall Oven codes

FC E8JennAir Wall Oven Code FC E8: Registration error FC E9JennAir Wall Oven Code FC E9: Wi-Fi power module wiring Feature Not AvailableJennAir Wall Oven Message "Feature Not Available": Follow the Prompt on the Display Flashing Time, Clock, 12:00, Power Loss or Enter TimeJennAir Wall Oven Display Flashing Time or 12:00: Set the clock after power loss Locked, Lock or LocJennAir Wall Oven Display Locked, Lock or Loc: Controls and door are locked Press Cancel to ResetJennAir Wall Oven Message "Press Cancel to Reset": Clear and power cycle Probe or Insert ProbeJennAir Wall Oven Display Probe or Insert Probe: Meat probe needed PUSH or PSHJennAir Wall Oven Display PUSH or PSH: Press start

F4 E4F4 E4 questions

Will timed microwave cooking still work with F4 E4?

It may, since the code concerns the humidity sensing. We recommend a check to be sure the manager board is fine. Moisture in the cavity can make the reading look wrong, so dry the cavity before testing it.

Could steam from cooking cause F4 E4?

Moisture can disturb the sensor, so a dry cavity is worth trying. A code that stays after drying points to a failed sensor or wiring.

How do you charge for a sensor repair?

You get a written price before work starts. We back our repairs with a 30-day workmanship warranty. The final price is stated in writing before work, with parts and labor listed.