KitchenAid Combination Oven Microwave Code F1 E6: microwave thermistor or sensor

What F1 E6 means

KitchenAid combination microwave-wall ovens, such as the KOCE500ESS, KOCE507ESS and KOCE900HSS, show F1 E6 when the microwave thermistor or sensor, or the associated wiring, may have a problem. The upper cavity uses that temperature reading to protect itself. With the reading gone, the control stops microwave cooking and shows the code on the display.

Common causes of F1 E6

Microwave thermistor reading out of range
Sensor connector or wiring loose
Control not receiving a proper sensor signal

✓ One safe check you can try

1. Press Cancel and let the unit sit with the door closed for a few minutes. 2. Switch the breaker off for a minute and on again. 3. Run a thirty-second test with a cup of water. 4. If F1 E6 returns, leave the microwave unused and arrange service.

! Why to stop there

Sensor readings must be measured with instruments
Opening the cavity wall risks contact with high-voltage parts
You get the price in writing before work and a 30-day workmanship warranty afterward

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.

→Same appliance

Other Microwave codes

Probe or Insert ProbeKitchenAid Combination Microwave Message "Probe" or "Insert Probe": Seat the meat probe in its jack PUSH or PSHKitchenAid Built-In Microwave Message PUSH or PSH: The oven is waiting for Start Registration ErrorKitchenAid Over-the-Range Microwave Message "Registration Error": Check the home network and try again Sabbath, Sab, 5Ab, or 5A6KitchenAid Built-In Microwave Display Sabbath, Sab, 5Ab or 5A6: Sabbath Mode is on SEKitchenAid Over-the-Range Microwave Code SE: Keypad or user interface problem F4 E9KitchenAid Combination Microwave Code F4 E9: Microwave inverter output problem F9 or F9E0KitchenAid Built-In Microwave Code F9 or F9E0: Check the electrical connection after installation Press Cancel to ResetKitchenAid Built-In Microwave Message "Press Cancel to Reset": Clear it, then reset power if Call Service shows

F1 E6F1 E6 questions

What does the thermistor do in the microwave cavity?

It measures temperature so the control can keep the cavity within safe limits. F1 E6 says that reading may be unreliable.

Could a hot kitchen trigger F1 E6?

Not by itself. A high room temperature does not change the thermistor, though a reset after cool-down is a fair first step.

Is the lower oven affected?

Typically no, since the code is specific to the microwave side. We still verify the whole unit during the visit.