Whirlpool Microwave F3C — What It Means & How to Fix It
Also shown as F4E1, F4 E1 on some models.
F3C and F4E1 point to the cavity temperature thermistor or its wiring; reset power for a minute, and have a technician check it if the code returns.
What this code means
Whirlpool says both codes may mean a problem with the cavity temperature thermistor or the associated wiring. This sensor reads the temperature inside the cooking cavity.
Whirlpool over-the-range microwaves.
Most likely causes
| Cause | How likely | DIY-fixable? |
|---|---|---|
| Cavity thermistor fault | Common | No — technician job |
| Wiring fault | Occasional | No — technician job |
| Misread | Occasional | Yes — breaker reset |
What you can try yourself
- Let the microwave cool.
- Breaker off for one minute, then on.
- Monitor and test.
- Schedule service on a repeat.
When to call a technician
- Repeat code.
- Convection temperatures wrong.
- Shuts off early.
Typical professional repair cost: About $120–$250.
Frequently asked questions
What does F3C mean?
A possible problem with the cavity temperature thermistor or its wiring.
Is F4E1 the same?
Yes, per Whirlpool.
What is a thermistor?
A temperature sensor whose resistance changes with heat.
Sources checked
- Whirlpool Product Help: F3C - Over-the-Range Microwave
- Whirlpool Product Help: F4E1 - Over-the-Range Microwave
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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