The short version
F3T1 means the resistance it reads across the user interface thermistor and its wiring left the window the control accepts. Before anything is replaced, a plug that backed out of its housing behind the rear panel accounts for a large share of these, and it is free to eliminate.
What this code is documented as meaning
Reference| Code | Documented meaning |
|---|---|
| F3T1 | There may be a problem with the User Interface Thermistor or the associated wiring. |
What the appliance does alongside the code
- The code appears and the cycle stops heating — Everything else looks normal — lights, fan, display — and only the heat is missing.
- The fault comes and goes with temperature — An intermittent connection opens as the metal expands and closes again when it cools, which is why the code often arrives part-way through a long cycle.
- NEAR MISS - nothing heats and no code shows at all — That is a power or element fault rather than a reading fault, and it belongs on the page for that symptom.
Causes in the order they actually occur
- A loose or corroded connector at the thermistor — Ranked first because it is the failure that needs no part: the probe is fine, the joint carrying its signal is not, and heat cycling at the back of the cavity is what works a pin loose.
- User interface thermistor out of tolerance — Second: the element itself drifts or opens with age, and once it reads outside the accepted band the control has nothing to work from.
The order to work through it
- Follow the harness for rub marks where it crosses metal — A witness mark tells you the fault is in the wire, not in the part at either end.
- Compare what the appliance claims against a separate thermometer — Ten minutes with an oven thermometer separates a drifting probe from a control that is being told the truth.
The owner-safe sequence
- Clear the code with a full power-down — A code that does not return was a single bad read.
About 5 min
- Let the cavity reach room temperature before anything else — A hot resistance reading means nothing, and a hot cavity is the reason half of these codes cannot be diagnosed on the spot.
About 45 min
- STOP HERE if the next step is a meter across the probe terminals — That means a panel off and a connector back-probed, which is where an owner check ends and a service call begins.
Where the risk actually is
Safety
Unplug the appliance or switch off its breaker before any panel comes off; a capacitor can hold a charge after the power is off. Everything in the procedure above stays outside the cabinet for that reason.
When to call a technician
The line is straightforward. Call once the code survives a full power-down: a repeatable reading fault is a probe, a harness or a board, and telling those three apart needs a meter and the resistance table for that model line.
Sibling codes
How far this page applies
Applies to: the model lines that use this probe on this cavity. Does not apply to: a specific model's wiring, its part numbers, or its service procedures, all of which vary and none of which are invented here. This page is the general reading of one code; where a more specific page exists for your family or model it is linked from the index below and it is the one to read first.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
