KitchenAid Combination Oven Code F4 E5: the microwave weight sensor

What F4 E5 means

KitchenAid combination microwave-wall ovens such as the KOCE500ESS or KOCE507ESS can show F4 E5 when the microwave weight sensor, or the associated wiring, may have a problem. The code is tied to the upper microwave cavity. You will see it on the display, and the microwave may stop working or cook without its usual automatic features. Because only the sensor and its wiring are named, the repair centers on that small circuit rather than on the heating side of the oven.

Common causes of F4 E5

Microwave weight sensor not responding
Wiring or connector at the weight sensor is damaged

✓ One safe check you can try

1. Cancel the cycle and remove everything from the microwave. 2. Check that the turntable or tray, if your model has one, sits properly. 3. Reset the breaker for one minute and restore power. 4. If F4 E5 comes back, stop using the microwave and call us.

! Why to stop there

The weight sensor sits in sealed parts under the cavity.
A wrong guess means paying for parts that were not the cause.
You approve a written price first, and our work 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 E5F4 E5 questions

Why would a microwave need a weight sensor?

In this combination oven, the weight sensor is one of the inputs the microwave control uses. When the sensor or its wiring has a problem, the oven posts F4 E5 instead of cooking.

Could a misplaced tray cause it?

Checking that everything is seated properly costs nothing. If the code stays after you do, the listed cause is the sensor or wiring, and that needs testing by a technician.

Is the lower oven affected?

The code refers to the upper microwave cavity. Judge the lower oven separately, use it only while it runs without a code, and stop using it if other codes appear.