JennAir JMV Code F3H1: humidity sensor circuit

What F3H1 means

On JennAir over-the-range microwave hoods, including the JMV9196CS and JMV8000 series, F3H1 is the message for a possible humidity sensor problem or a problem in its wiring. The sensor feeds the automatic cooking programs, so those programs are what you notice failing. You may see F3H1 right after pressing a sensor key or even at idle. You may see the code right after pressing a sensor key, or even while the microwave sits idle.

Common causes of F3H1

Humidity sensor has stopped giving a valid signal
Connector to the sensor is loose
Wiring to the sensor is pinched or damaged

✓ One safe check you can try

1. Cancel the cycle and let the cavity air out with the door open. 2. Clean away any spills around the door frame once cool. 3. Cook with manual time and power instead of sensor cooking. 4. Reset the breaker for one minute. 5. If F3H1 returns, schedule service.

! Why to stop there

Telling a sensor from its wiring takes a meter reading at the connector.
A new sensor does not help if the harness is the real source of the problem.
The sensor sits inside the housing, with live parts close by.
We quote in writing first and cover our work for 30 days.

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.

→Same appliance

Other Microwave codes

LOC or "L" or Padlock IconJennAir Microwave Message LOC, L or Padlock Icon: Control Lock Enabled Locked, Lock or LocJennAir Built-In Microwave Message "Locked, Lock or Loc": Control Lock On ":" or "." in displayJennAir Built-In Message ":" or "." in display: clock needs setting F8 E3JennAir Built-In Microwave Code F8 E3: one more cooling alert Sabbath, Sab, 5Ab, or 5A6JennAir Built-In Microwave Message "Sabbath, Sab, 5Ab, or 5A6": Sabbath Mode On F8 E4JennAir Built-In Microwave Code F8 E4: exhaust air sensor SEJennAir JMV Code SE: keypad problem F8E5JennAir JMV Code F8E5: exhaust air temperature sensor

F3H1F3H1 questions

Can I still reheat leftovers with F3H1 showing?

Yes, by setting time and power yourself. Skip Reheat and Sensor keys because they depend on the failing sensor. Stir and check temperature as you go.

Why does F3H1 appear when I press a sensor key?

Those programs ask the sensor for a reading as soon as you start. If the control cannot get one, it shows the code at once instead of cooking blind.

What happens if I ignore F3H1?

Manual cooking should carry on, but you lose sensor programs, and a developing wiring problem can spread. Booking a check keeps a small job from growing.