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Error code · Microwave

What F3T4 Means on a Whirlpool Over-the-Range Microwave: Magnetron Temperature Thermistor

F3T4 on a Whirlpool over-the-range microwave, such as model WMH31017HS, WMH32519HZ or WMH53521HZ, refers to the magnetron temperature thermistor or its wiring. The magnetron produces the microwave energy, and this sensor reports its temperature to the…

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Code
F3T4
Appliance
Microwave
Brand
Whirlpool
Warranty
30-day workmanship

What F3T4 means

F3T4 on a Whirlpool over-the-range microwave, such as model WMH31017HS, WMH32519HZ or WMH53521HZ, refers to the magnetron temperature thermistor or its wiring. The magnetron produces the microwave energy, and this sensor reports its temperature to the control. The display shows F3T4. The brand names no failed part and gives only a power reset, so the code is a reason to test the sensor circuit before running the oven again.

Common causes of F3T4

  • Magnetron temperature thermistor
  • Plug and leads at the magnetron sensor
  • Control board reading the sensor
✓ One safe check you can try

1. Leave the microwave idle while F3T4 is on the display. 2. Take the breaker off for a minute and put it back on. 3. Look for F3T4 on the display for a further minute. 4. If the display is clear, you may try a brief, normal cycle. 5. If F3T4 returns, keep the microwave off and call us.

! Why to stop there
  • A reset cannot tell us whether the thermistor, its wiring or the control is giving a wrong reading.
  • Because the sensor watches the magnetron's temperature, we test the circuit before the oven runs again.
  • The price is written and agreed before any repair.
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

Feature Not Available or Fault DetectedWhirlpool Built-in Microwave Message "Feature Not Available": Retry or Cut Power LOCWhirlpool Microwave LOC on the Display: Control Lock Is On PFWhirlpool Over-the-range Microwave Showing PF: Power Failure Indicator Press Cancel to ResetWhirlpool Built-in Microwave Message "Press Cancel to Reset": Error Cleared by Cancel F8 E4Whirlpool Microwave Drawer Error Code F8 E4: Exhaust Air Temperature Sensor Probe or Insert ProbeWhirlpool Built-in Microwave Asking for "Insert Probe": Seat the Meat Probe F8E5Whirlpool Microwave Code F8E5: Exhaust Air Temperature Sensor PUSH or PSHWhirlpool Built-in Microwave Shows PUSH or PSH: Press Start
F3T4F3T4 questions
Why is F3T4 rated higher than other sensor codes?

It concerns the temperature of the magnetron, the part that generates microwave energy. The brand gives no safety warning, but we are cautious about running it with an unproven sensor.

Can I use the microwave if F3T4 clears?

If it clears after the reset and the microwave works normally, you can use it, but watch closely. If the code comes back, stop using the unit.

What will you check?

We start with the magnetron thermistor and its connector, then the control that reads it. We tell you what we find and what it costs before repairing.

Book a visit

Still seeing F3T4?

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

(713) 589-6107