KitchenAid Combination Oven Code F4 E3: exhaust air temperature sensor in the microwave

What F4 E3 means

On KitchenAid combination microwave-wall ovens, including the KOCE500ESS and KOCE507ESS, F4 E3 refers to the microwave exhaust air temperature sensor, or the wiring connected to it. The code concerns the upper microwave cavity. The display shows it in place of normal settings, and the microwave section may not run until it is addressed. Treat the microwave section as out of service until it has been tested, since the oven is unable to watch the temperature of the air it expels.

Common causes of F4 E3

Microwave exhaust air temperature sensor failing
Wiring or connector problem at that sensor

✓ One safe check you can try

1. Press Cancel and clear the microwave cavity. 2. Make sure nothing blocks the oven's vents and the surrounding cabinet opening. 3. Turn the breaker off for a minute, then back on. 4. Try a short run with water. If F4 E3 appears again, call us.

! Why to stop there

The exhaust sensor is inside the oven body.
A wiring problem looks exactly the same on the display as a bad sensor.
You get a written price before any work, and our repair has a 30-day workmanship warranty.

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.

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F4 E3F4 E3 questions

What does the exhaust air sensor do?

It tracks the temperature of air leaving the microwave section. The control uses that reading to protect the oven, so a bad sensor or broken wire can post F4 E3.

Could my cabinet cause this?

Clear vents are worth a quick look because airflow affects temperature readings. The listed cause is still the sensor or wiring, so a repeat code needs testing.

Can I use the microwave carefully?

We advise against it while F4 E3 keeps returning. The oven is protecting itself, and forcing cycles only adds heat to a section it cannot monitor.