Whirlpool Microwave F3T1 — What It Means & How to Fix It
F3T1 points to the user interface thermistor — a temperature sensor at the control panel — or its wiring; reset power and call service if it returns.
What this code means
Whirlpool says F3T1 may mean a problem with the user interface thermistor or the associated wiring.
Whirlpool over-the-range microwaves.
Most likely causes
| Cause | How likely | DIY-fixable? |
|---|---|---|
| Thermistor fault | Common | No — technician job |
| Control panel overheated by cooktop heat | Occasional | Yes — let it cool, run the vent |
| Wiring fault | Occasional | No — technician job |
What you can try yourself
- Turn off the cooktop below and let the microwave cool.
- Reset power for one minute.
- Monitor the display.
- Schedule service on a repeat.
When to call a technician
- Repeat code when cold.
- Panel very hot.
- Display fading.
Typical professional repair cost: About $120–$300.
Frequently asked questions
What is the user interface thermistor?
A temperature sensor associated with the control panel. Whirlpool names it for F3T1.
Could cooking below cause it?
Whirlpool does not say; letting the unit cool before resetting is a sensible precaution.
How to reset?
Breaker off one minute.
Sources checked
Error meanings can vary by model. This guide was checked against the documentation above; use the manual for the model number on your own appliance when it differs.
Related Whirlpool codes
- Whirlpool Microwave E03 E03 — or a plain F2 — means the keypad reported a problem to the control board; reset power for one minute and call for service if it comes back.
- Whirlpool Microwave SE SE means there is a problem with the keypad (user interface) or its wiring — clean and dry the panel, reset power for a minute, and call service if SE remains.
- Whirlpool Microwave E11 E11 and E12 point to the microwave's gas sensor — the sensor used for automatic cooking — or its wiring; reset power for a minute, and expect to need a technician if it returns.
- Whirlpool Microwave E13 E13 means the oven did not pre-heat correctly, with a possible problem in the appliance control board or its wiring; reset power for a minute and call service if it repeats.
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