Whirlpool Microwave F3T3 — What It Means & How to Fix It
F3T3 points to the hood temperature thermistor — the sensor that watches heat rising from the cooktop — or its wiring; reset power and call service if it repeats.
What this code means
Whirlpool says F3T3 may mean a problem with the hood temperature thermistor or the associated wiring.
Whirlpool over-the-range microwaves.
Most likely causes
| Cause | How likely | DIY-fixable? |
|---|---|---|
| Hood thermistor fault | Common | No — technician job |
| Wiring fault | Occasional | No — technician job |
| Misread | Occasional | Yes — breaker reset |
What you can try yourself
- Let the cooktop and microwave cool.
- Reset power for one minute.
- Monitor.
- Service on a repeat.
When to call a technician
- Repeat code.
- Vent fan runs constantly or never.
- Underside very hot.
Typical professional repair cost: About $120–$250.
Frequently asked questions
What does F3T3 mean?
A possible problem with the hood temperature thermistor or its wiring.
What does that sensor do?
It monitors temperature at the hood side of the microwave, above the cooktop.
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.
More: all Whirlpool microwave codes · all Whirlpool codes · search by symptom