F4E3 names one sensor and its wiring: the microwave exhaust air temperature sensor. JennAir lists a one-minute reset.
Model compatibility: JennAir reuses codes across series and model years, so F4E3 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 microwave exhaust air temperature sensor, or the associated wiring.
Two items only
F4E3 lists only the Microwave Exhaust Air Temperature Sensor plus its wiring. No control board is named.
What the name suggests
Exhaust air is what the microwave section blows out, and a temperature sensor on it lets the control watch how warm that air gets. That is a general reading of the label; the sensor’s job, its position and the triggering temperature are not described by JennAir.
Reset steps from JennAir
Breaker(s) off, one minute.
Breaker(s) on.
Watch for one minute to see if F4E3 comes back.
Try the oven.
Should the code reappear immediately, JennAir has nothing further for owners. Testing the sensor along with the cabling is technician work.
Answers to likely questions
Where does the sensor live? JennAir is silent on that.
Can a blocked vent set off F4E3? Neither help page brings up venting or blockage for this code. Only two items are named.
Is the reset enough? JennAir gives no other owner action, so a repeat means service.
Also absent: an exhaust air temperature limit, model conditions and any owner test. Two named items and one reset are all there is.
Sibling F4E entries
F4E2: sensor/thermistor with the microwave appliance manager
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.
