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Whirlpool service — Whirlpool Microwave F3T4 Code

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Whirlpool Microwave F3T4 Code Magnetron Thermistor

Book a Repair (844) 968-2053
Daniel Reeves Written by Daniel Reeves Appliance Repair Content Specialist Published October 20, 2026

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Code overview at a glance.

The facts for this Whirlpool error, a plain-language snapshot, and what to confirm against your model number.

Error code F3T4
Appliance Microwave
Content status Verified
Quick answer

Meaning of F3T4 and the reset sequence for Whirlpool over-the-range microwaves.

Model note: Whirlpool reuses codes across series and model years, so F3T4 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.

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What this code may mean.

A plain-language reading of the code — always confirm against your model’s documentation.

There may be a problem with the Magnetron Temperature Thermistor or the associated wiring.

Product help names the magnetron temperature thermistor or its wiring as the area behind F3T4.

Applies to: over-the-range microwave models.

Resetting the microwave

Power the microwave down for one (1) minute at the breaker. Restore the supply at the breaker. Look at the display once more for one (1) minute to see whether the message is back. Finish by confirming it operates.

If it comes back: No luck with the reset? Ask a qualified technician about the magnetron temperature thermistor or its wiring.

Similar errors

Compare with F3T2, which concerns the convection thermistor. F3H1 covers the humidity sensor. Also see F4E9 (the Smart Pop control).

Service coverage for this microwave

Metro areas served: Miami, New York, Houston, Los Angeles and San Diego. Reach out at (844) 968-2053 with F3T4, the model number and your reset result in hand. Our oven repair page covers the wider cooking range.

Source: Whirlpool Product Help: F3T4 – Error Code – Over-the-Range Microwave

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Safety warning before you continue.

Stop immediately if you notice smoke, sparks, a burning smell, gas odor, or water near electrical parts.

Important

Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.

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Seeing this code on your appliance?

Book an Whirlpool appliance service visit for a clear estimate and approval before any repair.

Experienced technicians, clear diagnostics, and workmanship coverage on completed repairs.

Book a Repair (844) 968-2053

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Ready to restore your Whirlpool appliance?

Book a repair online or call us — clear estimates, approval before any work, and a workmanship warranty on completed repairs.

Book a Repair (844) 968-2053

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Tell us what’s wrong — we’ll take it from there.

Share a few details and we’ll confirm an appointment. Prefer to talk? Call us and we’ll help right away.

Prefer to call? (844) 968-2053
  1. Share the symptom Tell us the Whirlpool model and what’s going wrong.
  2. Confirm a window We’ll schedule a visit that fits your day.
  3. Approve before work You get a clear estimate — nothing starts without your OK.
Phone (844) 968-2053
Email info@whirlpoolservicecenter.support
Hours Mon–Sat: 8:00 AM – 7:00 PM
Service area Serving Miami, New York, Houston, Los Angeles and San Diego metro areas.
Response time Appointment timing depends on ZIP code, route capacity, and appliance type.
(844) 968-2053 Book a Repair