Straight to it
In plain terms, F3H1 means the resistance it reads across the humidity sensor and its wiring left the window the control accepts. The control stops the heat rather than work from a reading it cannot trust, so the cycle will not finish while the code stands.
What the documentation says about this code
Reference| Code | Documented meaning |
|---|---|
| F3H1 | There may be a problem with the Humidity Sensor or the associated wiring. |
What is happening apart from the display
- Temperature drifts, or the display disagrees with the food — A probe reading a few ohms off is still inside its window, so the cabinet runs cool or hot before the code ever latches.
- The appliance runs longer than it used to for the same result — A reading that is drifting rather than failing stretches every cycle before it ever raises a code.
- 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.
The likely causes in order
- A loose or corroded connector at the sensor — 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.
- A chafed or pinched harness between the probe and the board — Third: a wire rubbed through against sheet metal reads exactly like a failed probe from the board's side, which is why the harness is checked before the board is condemned.
Where to start, and what follows
- 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.
- Only then treat the board as a candidate — Order matters because every check above is free and the board is not.
The safe checks, step by step
- Clear the code with a full power-down — A code that does not return was a single bad read.
About 5 min
- Run the shortest cycle the appliance offers and watch for the code — A short cycle that stays clean while a long one fails tells a technician the fault is thermal.
About 20 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.
Safety first, and it is not optional
Safety
Power off at the breaker or at the plug before any panel is removed - a capacitor can hold a charge after the power is off. The owner-side checks on this page need no panel removed at all.
The point at which you call
Where an owner stops: 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. And where nobody should wait at all: call straight away if you smell hot insulation or see discoloured wiring at the back — a connector hot enough to discolour is arcing, and that is a different and more urgent problem than the reading the code named.
Codes read alongside this one
The scope of this reading
This reading is written for the model lines that use this probe on this cavity, and it stays with the code in its title. If a page exists for your exact family or model, that page is the more specific answer and it should be read first; the code index linked below is where those pages are listed.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
