Kenmore Dryer Error Code F-28

F-28 indicates that the moisture sensor strip circuit is open, meaning the control board detects no continuity through the moisture sensing system. This code only appears during the dryer's diagnostic test mode, not during standard operation. The moisture sensor is made up of two metal bars inside the drum that measure fabric dampness to control cycle length. The fault can be caused by damaged sensor bars, broken wiring, or corroded connectors.

The dryer will typically still run with an F-28 error, but it will lose the ability to automatically sense moisture levels, which may cause it to default to timed drying. This is not a fire or safety hazard in most cases, but running cycles without moisture sensing can lead to over-drying or under-drying clothes. It is best to diagnose and repair the sensor circuit as soon as possible to restore normal operation.

Repair costs vary depending on the specific cause. Cleaning the sensor bars costs nothing beyond a small amount of rubbing alcohol. Replacing the moisture sensor bars or a wiring harness typically runs between $20 and $80 in parts. If a control board replacement is needed, parts and labor combined can range from $150 to $350 or more depending on your location and the service provider.

Many of the causes behind F-28 are DIY-accessible, such as cleaning residue off the sensor bars, reseating loose connectors, or replacing a damaged wiring harness. Replacing the sensor bars themselves is also a straightforward repair for someone comfortable working inside a dryer cabinet. However, if the control board is at fault, board replacement can be more involved and may be better handled by a technician.

Because F-28 only appears in diagnostic test mode, simply powering the dryer off and on will not address the underlying open circuit in the sensor system. The error will return the next time a diagnostic test is run if the sensor circuit is still faulty. The root cause, whether it is a damaged sensor, broken wire, or corroded connector, must be repaired for the code to clear permanently.