Written by
Maren Coleman Appliance Care EditorPublished October 29, 2026
VERIFIED
Error codeF3T4
ApplianceMicrowave
What the display is pointing at
F3T4 is listed in Whirlpool Product Help as a possible issue with the Magnetron Temperature Thermistor or its wiring, and it applies to over-the-range microwaves.
First, the reset
Flip the circuit breaker off. Wait one (1) minute before continuing.
Flip it back on once that minute is up.
Observe the microwave for one (1) minute to see if the error shows again.
Check the microwave runs.
Same code again
If the same message appears after the reset, hand the microwave to a qualified technician.
Similar codes
F3T3 points to the hood temperature thermistor, which is easy to mix up with this one.
San Francisco owners who need a technician for this microwave can reach us on (415) 687-4102 or start from Whirlpool microwave repair. It helps to have the F3T4 code, the model number and the reset result written down.
Model compatibility: 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.
Plain language
What this code means
F3T4 means the Magnetron Temperature Thermistor or its wiring may have a fault.
Important safety warning. 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.
Seeing this code on your Whirlpool appliance?
Book a specialist visit for a clear estimate and approval before any repair.
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You submit a request with your appliance model and symptom, we confirm an appointment window, and a technician performs an on-site diagnosis. You then receive a clear estimate and decide whether to proceed before any repair begins.
Yes. We provide an upfront estimate after diagnosis. No parts are ordered or installed until you approve the work, so there are no surprise charges.
Replacement parts are selected for the exact model and confirmed with you before ordering or installation.
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