KitchenAid Over-the-Range Microwave Code F3T3: hood temperature thermistor

What F3T3 means

On KitchenAid over-the-range microwaves such as the KMHS120ESS, KMHC319ESS or KHMS155LSS, F3T3 means there may be a problem with the hood temperature thermistor, or the wiring to it. The hood thermistor watches the heat rising from the range below. A lost reading may stop the fan or cooking, and the code stays on the display.

Common causes of F3T3

Hood thermistor failed
Wiring loose
Control not reading the thermistor

✓ One safe check you can try

1. Press Cancel and let the microwave cool for ten minutes. 2. Make sure nothing blocks the range hood vents. 3. Unplug the microwave for a minute and plug it back in. 4. Test the fan. 5. If F3T3 returns, call us.

! Why to stop there

The sensor lives in the hood area above your cooktop
A meter test confirms the true cause
Written price first and 30 days of 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.

→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 E8KitchenAid Combination Microwave Code F4 E8: Inverter or its wiring flagged F9KitchenAid Over-the-Range Microwave Code F9: Two boards and their wiring are suspect ":" or "." in displayKitchenAid Built-In Microwave Display ":" or ".": The clock needs setting

F3T3F3T3 questions

Why does a microwave watch hood temperature?

It sits above the range and must cope with rising heat. The thermistor lets it protect itself.

Could a large pot on the range trigger it?

Heavy cooking can raise temperatures, but a lasting code means the thermistor or wiring needs checking.

Does F3T3 stop the range?

No. The range is independent. Only the microwave is affected.