Kenmore Dryer F28 Error Code: Causes, Cost & Fix

What is the Kenmore Dryer F28 error?#

F28 on a Kenmore dryer is a moisture-sensor fault: the two metal sensor bars inside the drum are no longer reading dampness correctly, so auto-dry quits early and leaves loads damp — or occasionally overdries them. It is not a hazard, and better still, it is often just a film of buildup rather than a broken part. The first thing I do is clean those sensor bars, because dryer-sheet wax coating them is the usual culprit.

F28 on a Kenmore Dryer: likely causes and repair cost#

On a Kenmore Dryer, the F28 code signals: moisture sensor failure.

Typical professional repair: $50–$175 · Difficulty: easy · often owner-fixable

Fastest thing to try first: Clean moisture sensor bars with fine sandpaper.

Symptoms that often accompany F28: Auto-dry quits early and leaves the load damp; Timed dry works fine but auto-dry will not; Some loads come out badly overdried

Technician diagnostic sequence for F28:

1. Locate the two metal sensor bars inside the drum near the lint screen
2. Clean with fine sandpaper or rubbing alcohol to remove fabric softener residue
3. Test continuity from sensor bars to control board connector
4. If bars are corroded through, replace the sensor assembly

Parts a technician may check or replace: moisture sensor assembly

Field note: The Whirlpool-built 110-series Kenmore senses dryness through two metal bars just inside the drum near the lint screen. Dryer-sheet wax builds an insulating film across those bars that fools the auto-dry logic, so wipe them down monthly with rubbing alcohol if you use sheets before assuming the sensor has failed.

How to troubleshoot the F28 error yourself#

This is one of the more owner-fixable dryer codes, so it is worth a try before calling anyone. Locate the two metal sensor bars just inside the drum near the lint screen. Clean them with fine sandpaper or rubbing alcohol to strip off the invisible fabric-softener film that insulates them and fools the auto-dry logic. Run an auto-dry cycle afterward to confirm it now senses correctly.

If cleaning does not restore it, the table above has a technician testing continuity from the sensor bars back to the control connector and replacing the sensor assembly if the bars are corroded through. That wiring test and part swap is the professional half, but many F28s never get there — the field note's habit of wiping the bars monthly with alcohol if you use dryer sheets keeps this code from coming back at all.

Is the Kenmore Dryer F28 error worth fixing?#

F28 is about as cheap as dryer repairs get, and often free. The table above lists $50 to $175 for a professional fix, but the common cause — softener buildup on the sensor bars — costs nothing to clean off yourself. Even a replacement moisture-sensor assembly is inexpensive, so on any dryer worth keeping this is an easy repair to justify. There is essentially no case where F28 alone would push me toward a new machine.

Kenmore Dryer F28: frequently asked questions#

What does the F28 error mean on a Kenmore dryer?#

It is a moisture-sensor failure: the metal sensor bars in the drum are misreading dampness, so auto-dry ends early and leaves loads damp, or sometimes overdries them.

Is it safe to keep using a Kenmore dryer showing F28?#

Yes — it is safe, and timed dry still works normally. Only the auto-dry function is affected, so you can use timed cycles until the sensor is cleaned.

Can I clear the F28 error myself, or do I need a technician?#

Usually yourself: clean the two sensor bars in the drum with fine sandpaper or alcohol. Only a corroded-through sensor or wiring fault needs a technician.

How much does it cost to repair F28 on a Kenmore dryer?#

The table above lists $50 to $175 for a professional repair, though cleaning the sensor bars yourself often resolves it for free.

Which parts usually fail when a dryer throws F28?#

Usually nothing — it is fabric-softener buildup on the sensor bars. When a part fails it is the moisture-sensor assembly or its wiring.

Is a Kenmore dryer with F28 worth repairing?#

Yes — it is frequently a free cleaning, and even the sensor assembly is cheap, so it is worthwhile on any usable dryer.

Why does softener buildup trigger F28?#

The sensor bars gauge dryness by the load's conductivity across them. A waxy softener film insulates the bars, so they misread moisture and the control flags F28.