Written by
Maren Coleman Appliance Care EditorPublished October 29, 2026
VERIFIED
Error codeF3T1
ApplianceMicrowave
What F3T1 is telling you
The code names one component: the User Interface Thermistor, along with the wiring that serves it. Whirlpool documents F3T1 for over-the-range microwaves.
Reset sequence
Open the circuit breaker feeding the microwave, or pull its plug, and keep it dead for a full minute.
Close the breaker again so the unit powers up.
Stay with it for another minute and see whether F3T1 returns.
Run the microwave to be sure it behaves normally.
When the code stays
A code that survives the reset is a job for a qualified technician, who can look at the thermistor and the wiring around it.
Compare with these codes
F3T2: the same thermistor wording, but for the convection thermistor.
F3H1: a humidity sensor message in the same F3 group.
F2Q1: a touchpad fault rather than a thermistor one.
Whirlpool microwave service in San Francisco
Owners across San Francisco and the Bay Area can book Whirlpool microwave repair by calling (415) 687-4102. Have the F3T1 code, the model number and a note on the breaker reset ready when you call.
Model compatibility: Whirlpool reuses codes across series and model years, so F3T1 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
F3T1 means the User Interface 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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