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Error code · Microwave

Maytag Microwave Code F3T4: Magnetron Sensor or Wiring

F3T4 on a Maytag over-the-range microwave refers to the magnetron temperature thermistor or the wiring that serves it. The magnetron is the part that produces microwave energy, and its temperature sensor lets the control watch how…

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Code
F3T4
Appliance
Microwave
Brand
Maytag
Warranty
30-day workmanship

What F3T4 means

F3T4 on a Maytag over-the-range microwave refers to the magnetron temperature thermistor or the wiring that serves it. The magnetron is the part that produces microwave energy, and its temperature sensor lets the control watch how hot it runs. When that reading cannot be trusted, you see F3T4 and the microwave may stop heating. A passing code after a power blip is possible, so a repeat is what tells us the circuit needs attention.

Common causes of F3T4

  • The magnetron temperature thermistor
  • Wiring and plug connections to that sensor
  • Airflow that cools the magnetron
  • Control response to the sensor reading
✓ One safe check you can try

1. Switch the microwave's breaker off and wait one minute. 2. Switch it back on. 3. Stay near the microwave for a minute and see if F3T4 reappears. 4. Make sure the vents on the top and sides of the unit are not covered or crowded by cabinet items.

! Why to stop there
  • The code tells us where to look but not whether the sensor or its connector is the cause
  • We test the sensor circuit and the cooling path before any part is ordered
  • You approve a written price first, and our work is covered for 30 days
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

F9Maytag Microwave Code F9: Two Boards to Check F9Q or F9Q1Maytag Microwave Code F9Q or F9Q1: Reset and Function Failure FC E1, FC E2 or FC E3Maytag Microwave Code FC E1, FC E2 or FC E3: Wi-Fi Connection Lost FC E7Maytag Microwave Code FC E7: Microwave Cannot Reach the Router FC E8 or Registration ErrorMaytag Microwave Code FC E8 or Registration Error: Setup Entry Problem Flashing 0:00Maytag Countertop Microwave Code Flashing 0:00: Clock Reset After Power Loss Flashing Colon or PFMaytag Microwave Code Flashing Colon or PF: Power Loss Notice LOC, L or Padlock IconMaytag Microwave Code LOC, L or Padlock Icon: Control Lock On
F3T4F3T4 questions
Is F3T4 dangerous?

The microwave is built to stop when it senses a problem, which is what the code reflects. Do not keep forcing cycles if it returns. Leave it idle until we have checked it.

Does a blocked vent cause F3T4?

The code itself points to the sensor or its wiring. Still, poor airflow can run the magnetron warmer, so we look at the vents and fan as part of the visit.

Can an old over-the-range Maytag still be fixed for F3T4?

Often it can. We explain the written price before we start and tell you straight if the repair does not make sense for the age of the unit.

Book a visit

Still seeing F3T4?

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

(713) 936-6390