Published September 2, 2026Updated October 17, 2026
Content status:
Verified
Error codeF4E1
ApplianceMicrowave
Quick answer
F4E1 names a thermistor-type part; the over-the-range and built-in JennAir articles word it differently.
Model compatibility: JennAir reuses codes across series and model years, so F4E1 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
Possible problem with the cavity temperature thermistor (over-the-range) or the microwave sensor/thermistor and microwave appliance manager (built-in), or the associated wiring.
Two descriptions exist for F4E1, and your microwave type decides which one fits.
Type
Possible problem
Over-the-range
Cavity temperature thermistor, or wiring
Built-in
Microwave sensor or thermistor, microwave appliance manager, or wiring
The extra item for built-ins
Only the built-in article puts the microwave appliance manager on the list. It is not defined on the page, and the code does not tell the manager apart from the sensor. For over-the-range models the list is just the thermistor and its wiring.
Reset for either type
Breaker off for a minute.
Breaker on.
Look at the display for a minute.
Use the microwave to verify that it works.
On the over-the-range page the entry ends with a note that a qualified technician may be needed.
Why the cavity reading matters
The cavity is where the food sits, which makes its temperature a basic piece of information for the control. JennAir supplies no further cause, so a code that keeps coming back needs diagnosis rather than a string of resets.
What the reset can and cannot do
Trying it costs nothing, because both wordings end with a sensor or wiring. A failed part will not be repaired by it, and JennAir makes no such promise. The value lies in learning whether the condition is still present after the control restarts.
Related codes
F3C: cavity temperature thermistor on over-the-range units.
F4E2: the built-in sensor and appliance manager wording.
Microwave service in Los Angeles
If F4E1 will not stay away, call (310) 622-9465. Tell us whether the unit is over-the-range or built-in and give the model number.
Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Seeing this code on your JennAir appliance?
Book a specialist visit for a clear estimate and approval before any repair.
