F4E3 names the microwave exhaust air temperature sensor or its wiring. KitchenAid suggests a power reset first.
Model compatibility: KitchenAid 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 its wiring.
Two suspects only
For F4E3 KitchenAid names just the microwave exhaust air temperature sensor and its wiring.
Breaking down the name
Each word in the name narrows it down: microwave section, exhaust air, temperature. As general background, exhaust air is air that is leaving a compartment, and a sensor placed in it lets the control know how warm that air is. KitchenAid does not say where this sensor is mounted or at what temperature the code triggers.
The reset
Shut off the oven’s circuit breaker.
Wait sixty seconds, then restore power.
Stay within sight of the oven for a minute to learn if F4E3 returns.
Check that the oven operates as it should.
Dos and don’ts
Do carry out the reset exactly as listed.
Do record whether the code comes back, and when.
Do not remove trim or panels to look for the sensor; KitchenAid supplies no directions for reaching it.
Is F4E3 the oven’s exhaust fan code?
No. It concerns the microwave’s exhaust air sensor, while the fan codes on the oven side have their own entries in KitchenAid’s list.
If it comes back
A repeat of F4E3 after the reset is the time to contact service.
Codes worth comparing
F4E6: a second temperature sensor in the microwave, at the wave guide
F8E4 / F8E5: the exhaust fan air temperature sensor on the oven side
Microwave combination oven repair in Los Angeles
If your KitchenAid keeps showing F4E3, ring (310) 363-8964 for service in Los Angeles. We will ask for the code and what happened when you cycled the breaker.
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 KitchenAid appliance?
Book a specialist visit for a clear estimate and approval before any repair.
