Kenmore Dryer F28 Error Code — What It Means
F28 on a Kenmore dryer signals a moisture sensor circuit fault. This code appears on Whirlpool-built Kenmore electronic dryers and indicates a problem with the moisture-sensing circuit or its communication with the control board, not a heating or airflow issue. The dryer cannot properly read fabric moisture levels, so it halts the cycle and displays the error. On Kenmore Elite HE3-style models, the code is listed as Moisture Sensor Fail.
The error is typically caused by contaminated sensor bars, loose wiring, or a failed sensor assembly rather than a board-level electronics problem. Because the moisture sensor circuit relies on physical contact between sensor bars and damp fabric, lint buildup and fabric softener residue are frequent culprits. Whirlpool recommends a power reset and test run as the first troubleshooting step.
Common Causes
- Dirty or coated moisture sensor bars Lint, fabric softener residue, or detergent film on the sensor bars prevents proper moisture reading and triggers the fault.
- Loose, oxidized, or damaged wiring and connectors Poor connections in the moisture sensor circuit are the most common practical cause reported by repair technicians.
- Failed moisture sensor assembly If wiring and cleanliness are good, the sensor itself may have failed and will need replacement.
- Control board communication issue On some Whirlpool-built platforms, a main control board or user interface board fault can produce F28 if reseating connectors does not clear the code.
Step-by-Step Fix
- Turn off the dryer at the circuit breaker for at least five minutes to perform a full power reset, then restore power.
- Start a short Time Dry test cycle and monitor the dryer for about one minute to see if the F28 code returns immediately.
- Disconnect power and locate the moisture sensor bars inside the drum, usually near the lint filter housing or along the front rim, and inspect the wiring harnesses and connectors for looseness, corrosion, or damage.
- Clean the sensor bars thoroughly with a soft cloth and rubbing alcohol to remove lint, fabric softener film, and detergent residue, then wipe dry.
- Check the sensor circuit wiring and connectors for continuity and stable connections using a multimeter if the error persists after cleaning.
- Replace the moisture sensor assembly if the wiring is intact and the sensor is clean but the code continues to appear.
- Inspect or replace the main control board only if symptoms and testing point to a control-side communication fault rather than a local sensor or wiring problem.
Parts Often Needed
| Part | Notes |
|---|---|
| Moisture sensor assembly | Amazon | Primary component for F28 faults after wiring and cleanliness are verified. |
| Dryer wiring harness | Amazon | Replace if connectors or wires in the moisture sensor circuit are damaged or corroded. |
| Main electronic control board | Amazon | Only required if testing confirms a board-level communication fault rather than a sensor issue. |
When to Call a Pro
If you are uncomfortable working with electrical connections or if the error returns after cleaning the sensor bars and reseating all connectors, call a qualified appliance technician. Also call a pro if multimeter testing reveals wiring faults you cannot trace or if the code persists after replacing the moisture sensor assembly, since control board diagnosis requires model-specific knowledge and test points not covered in general guides.