KitchenAid Combination Oven Code F4 E1: thermistor, appliance manager or wiring

What F4 E1 means

The microwave section of KitchenAid combination microwave-wall ovens, for instance the KOCE507ESS, can show F4 E1 when the thermistor, the appliance manager, or the associated wiring may have a problem. The code refers to the upper microwave cavity. You will see it on the display, and microwave cooking may stop or refuse to start. The microwave cavity is the only area named, so the lower oven is judged separately and should be used only if it shows no code of its own.

Common causes of F4 E1

Thermistor in the microwave cavity reading wrongly
Appliance manager (the controlling board) not responding
Wiring problem in the thermistor circuit

✓ One safe check you can try

1. Press Cancel and take any food out of the microwave. 2. Turn the breaker off for about a minute, then on. 3. Run a short cycle with a cup of water. 4. If F4 E1 comes back, stop using the microwave and call us.

! Why to stop there

A thermistor and its control board look the same from the front.
The cavity wiring sits near high-voltage microwave parts.
We provide a written quote beforehand and back the work with 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 E1F4 E1 questions

What is a thermistor?

A thermistor is a temperature-sensing part. In the microwave cavity of a combination oven, the control uses it to follow temperature, so a bad reading or broken connection can trigger F4 E1.

Is the appliance manager the same as the clock board?

It is the control that manages the microwave functions, so it can be the cause even when the thermistor is fine. We test both before quoting a repair.

Can I keep using the lower oven?

The code concerns the upper microwave cavity. If the lower oven runs normally and shows no codes, use it carefully, and call us about the microwave.