JennAir Built-In Microwave Code F3 E4: probe must be seated firmly

What F3 E4 means

Some JennAir built-in microwaves and combination wall oven microwave cavities, including the JMC2427LL, display F3 E4 when the meat probe is not securely in its receptacle. The instruction here is simply to confirm that the probe is pushed in tightly, because the socket location differs by model. You will see the code during a probe cycle, and cooking may stop until the probe is seated.

Common causes of F3 E4

Meat probe plug not fully inserted
Probe knocked loose when food or a rack was moved
Receptacle worn so the plug does not hold

✓ One safe check you can try

1. Let the cavity cool enough to touch safely. 2. Push the probe plug firmly into the receptacle until it stops. 3. Check that the cord is not caught in the door. 4. Restart the cycle. If F3 E4 returns with the probe seated, switch to timed cooking and call us.

! Why to stop there

A worn receptacle will not hold a plug, and bending it makes it worse.
The cause can lie in the wiring, which only a technician can test.
We replace parts only after quoting the price in writing.

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

FCE8JennAir OTR Microwave Code FCE8: wrong appliance type or model chosen Flashing 0:00JennAir Countertop Microwave Message Flashing 0:00: Reset the Clock Flashing ":" or PF in displayJennAir OTR Microwave Message Flashing ":" or PF: Power Failure or Clock Off 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

F3 E4F3 E4 questions

Why do I see F3 E4 after loading the oven?

Moving food or a rack can nudge the probe out of its socket. The unit notices the missing connection immediately and shows the code until you reseat the plug.

Is F3 E4 harmful to the microwave?

No. It is a prompt to seat the probe. It becomes a repair question only if the code stays after the plug is firmly in.

Where is the receptacle?

The location varies by model, so check the cavity wall near the front. If you cannot find it, tell us your model and we will point you to it.