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Error code · Microwave

Whirlpool Over-the-Range Microwave with Error F3T2: Convection Thermistor

On Whirlpool over-the-range microwaves with convection, such as WMH31017HS, WMH32519HZ or WMH53521HZ, F3T2 refers to the convection thermistor or its wiring. That sensor reports the temperature during convection heating. The microwave displays the code, and the…

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Code
F3T2
Appliance
Microwave
Brand
Whirlpool
Warranty
30-day workmanship

What F3T2 means

On Whirlpool over-the-range microwaves with convection, such as WMH31017HS, WMH32519HZ or WMH53521HZ, F3T2 refers to the convection thermistor or its wiring. That sensor reports the temperature during convection heating. The microwave displays the code, and the brand's guidance is a power reset with no named failed part. We use F3T2 to decide which sensor circuit to test. A thermistor is a small part whose resistance changes with temperature.

Common causes of F3T2

  • Convection thermistor
  • Thermistor lead and plug
  • Control board reading the sensor
✓ One safe check you can try

1. Shut off the circuit breaker, wait sixty seconds, and turn it back on. 2. Read the display right away. 3. Read it again after a minute. 4. If F3T2 is not there, run a short cycle to verify operation. 5. If it is, let us test the convection sensor circuit.

! Why to stop there
  • The reset does not tell us whether the sensor, wiring or control is reading wrongly.
  • We test the convection sensor circuit first, then the control.
  • A written price comes before any repair, with a 30-day workmanship warranty on completed work.
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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F3T2F3T2 questions
What is the convection thermistor?

It is a temperature sensor used when the microwave heats with convection. F3T2 says the control has a problem with the sensor or its wiring.

Can I still microwave food with F3T2 showing?

The brand does not say. The code concerns the convection sensor, but the control is reporting a problem, so we suggest stopping use if it returns after the reset.

What will you check first?

The thermistor connection and the sensor reading, because that is the part the code names. Then we check the control that reads it. Then we explain the result and quote before repairing.

Book a visit

Still seeing F3T2?

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

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