Kenmore Dryer Error Code F-28
Moisture sensor strip is open (only appears in diagnostic test mode).
Moisture sensor strip is open (only appears in diagnostic test mode).
First step from the service manual
See TEST #5, page 11.
The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.
Get the full diagnostic procedure for F-28.
- Step-by-step tests with expected resistance, voltage, and continuity values
- Wiring diagram references and connector pinouts from the OEM service manual
- Verified part numbers when replacement is required
$29/month · Cancel anytime · Or $9.95 3-day pass
What F-28 means on a Kenmore dryer
The F-28 error code on a Kenmore dryer indicates that the moisture sensor strip circuit is open. This means the control board is detecting no continuity through the moisture sensor circuit, which prevents the dryer from accurately measuring the moisture level in the drum. The moisture sensor consists of two metal sensor bars located inside the drum, typically near the lint screen area. When clothes tumble against these bars, the conductivity between them changes based on how wet the fabric is, allowing the control board to determine remaining dryness and adjust cycle time accordingly.
An open circuit in this sensor system can result from a broken sensor bar, a disconnected or damaged wiring harness leading from the bars to the control board, or corrosion at the connector terminals that interrupts the signal path. Because F-28 only appears during the diagnostic test mode and not during normal operation, the dryer may still run cycles but will lose its automatic moisture-sensing capability, potentially defaulting to timed drying.
Diagnosis should begin with TEST #5 as referenced in the service documentation. This test will walk through checking the sensor strip continuity and the associated wiring. Technicians should inspect the sensor bars visually for physical damage or residue buildup, check connector integrity at both the sensor end and control board end, and measure resistance or continuity across the circuit to pinpoint whether the fault is in the sensor bars themselves or in the wiring harness.
Source: manufacturer service documentation.
Common causes of F-28
- 01
Broken or damaged sensor bars
Part replacementThe metal sensor strips inside the drum can crack, corrode, or become coated with dryer sheet residue to the point where the circuit reads as open. Visually inspect the bars for physical damage and clean them with rubbing alcohol to rule out coating buildup.
- 02
Disconnected or damaged wiring harness
Wiring / connectionThe wiring connecting the sensor bars to the control board can become pinched, frayed, or disconnected over time. Trace the harness from the sensor bars to the control board and check for any visible breaks or loose connectors.
- 03
Corroded or loose connector terminals
Wiring / connectionMoisture inside the dryer cabinet can cause the electrical connectors in the sensor circuit to corrode, increasing resistance until the circuit reads as fully open. Check each connector in the sensor circuit for oxidation or loose pin fit.
- 04
Faulty control board
Part replacementIf the sensor bars and all wiring check out as intact and continuous, the control board itself may have failed and is incorrectly reporting an open circuit. This is less common but should be considered after ruling out the sensor and wiring.
Frequently asked questions about F-28
What does F-28 mean on a Kenmore dryer?
Can I fix a Kenmore dryer F-28 error myself?
Is a Kenmore dryer showing F-28 safe to use?
Will resetting the dryer clear the F-28 error code?
How much does it cost to repair a Kenmore dryer with an F-28 error?
78,000+ service manuals · 160,000+ error codes · 55+ brands
Get Started$29/month · Cancel anytime · Or $9.95 3-day pass