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Error code · Microwave

What F3C Means on a Whirlpool Over-the-Range Microwave: Cavity Temperature Thermistor

F3C on a Whirlpool over-the-range microwave, such as WMH31017HS, WMH32519HZ or WMH53521HZ, relates to the cavity temperature thermistor and its wiring. A thermistor is a small sensor that tells the control how hot the cooking space…

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Code
F3C
Appliance
Microwave
Brand
Whirlpool
Warranty
30-day workmanship

What F3C means

F3C on a Whirlpool over-the-range microwave, such as WMH31017HS, WMH32519HZ or WMH53521HZ, relates to the cavity temperature thermistor and its wiring. A thermistor is a small sensor that tells the control how hot the cooking space is. The display shows F3C. The brand's guidance is a power reset and it names no failed part, so we treat F3C as a sensor circuit to test.

Common causes of F3C

  • Cavity temperature thermistor
  • Wiring and connector for the thermistor
  • Control reading the thermistor
✓ One safe check you can try

1. At the breaker panel, turn the microwave's circuit off. 2. Wait a minute. 3. Turn it on. 4. Keep watching the display for a minute for F3C. 5. If it stays away, heat a cup of water for a short time to verify the microwave. 6. If F3C returns, stop using the unit and call us.

! Why to stop there
  • The reset restarts the control but cannot show whether the thermistor, its wiring or the control is the cause.
  • We check the thermistor circuit first and confirm before replacing anything.
  • A written price comes before work, and repairs carry a 30-day 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.
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Other Microwave codes

F9QWhirlpool Over-the-range Microwave with F9Q on the Display: Power Reset Code SEWhirlpool Over-the-range Microwave Error SE: Keypad Circuit F9Q1F9Q1 on a Whirlpool Over-the-Range Microwave: Touch Pad Circuit FC E1Whirlpool Over-the-range Microwave Wi-Fi Code FC E1: Weak Signal FC E2FC E2 on a Whirlpool OTR Microwave: Router Connection Lost FC E3Whirlpool Over-the-range Microwave Showing FC E3 for Wi-Fi: Module Check FC E7Whirlpool OTR Microwave Connection Code FC E7: Appliance Not Reaching the Internet FC E8Whirlpool OTR Microwave Registration Code FC E8: Entry Mistake
F3CF3C questions
What is the cavity temperature thermistor?

It is a sensor that reports the temperature of the cooking space to the control. F3C says that reading or its wiring is not right.

Is F3C the same as plain F3?

No. Plain F3 on built-in microwaves refers to the oven control. F3C on over-the-range models names a sensor, so the check is different. That difference decides which circuit we open first.

Can I keep using the microwave with F3C?

If the code clears after the reset and the microwave works, you may continue. If it returns, stop using it until the temperature sensor circuit is checked.

Book a visit

Still seeing F3C?

A technician diagnoses it on site and gives you the price in writing before any work starts.

(713) 589-6107