Whirlpool Dryer F-29 Error Code — What It Means
The F-29 code on Whirlpool Cabrio and Duet-style dryers signals a moisture sensor circuit problem. The control board is seeing an abnormal signal from the sensor bars that detect fabric dryness during auto cycles. This can mean the bars are shorted together by lint or residue, the wiring harness is loose or damaged, or the sensor assembly itself has failed.
In most field cases the sensor bars at the drum outlet grille are coated with detergent film or dryer sheet buildup. The bars need clean metal-to-metal contact with tumbling fabric to work correctly. A dirty or corroded sensor will send a false signal and trigger F-29 even though nothing is electrically broken.
Common Causes
- Lint or detergent film on moisture sensor bars Residue from dryer sheets and detergent coats the bars and creates a false short or prevents proper sensing.
- Loose or damaged wiring connector The harness between the sensor bars and the main control can work loose, corrode, or develop broken conductors.
- Damaged or corroded sensor bars Physical wear, corrosion, or broken mounting tabs on the sensor assembly at the lint screen outlet grille.
- Failed control board moisture sensor input If the sensor and wiring check good but the fault returns, the control board circuit for the moisture sensor may be defective.
Step-by-Step Fix
- Turn off the dryer circuit breaker for five minutes, then restore power and run a Timed Dry cycle to see if the fault clears.
- Remove the lint screen and locate the two metal moisture sensor bars at the outlet grille inside the door opening, usually just below the lint screen housing.
- Clean both sensor bars thoroughly with a cloth dampened in rubbing alcohol or white vinegar to remove all lint, detergent film, and residue until the metal is bright and clean.
- Inspect the sensor bars for corrosion, physical damage, or broken mounting hardware and verify they are firmly attached and not touching each other.
- Check the wiring harness and connector from the sensor bars to the main control for loose pins, frayed wires, or rubbed-through insulation.
- Run a Timed Dry test cycle to confirm the fault is gone. If F-29 returns after cleaning and the sensor looks good, test continuity from the sensor terminals through the harness to the control connector.
- Replace the moisture sensor assembly if the bars are damaged or corroded beyond cleaning, or replace the control board if the sensor and all wiring test normal but the code persists.
Parts Often Needed
| Part | Notes |
|---|---|
| Moisture sensor bar assembly | Amazon | Located at the drum outlet grille behind the lint screen. Verify your model number before ordering. |
| Dryer wiring harness (sensor to control) | Amazon | Order if the connector or wiring between the sensor and control board is damaged or corroded. |
| Electronic control board | Amazon | Replace only after confirming the sensor and wiring are good. Match the board part number to your dryer model. |
When to Call a Pro
Call a technician if cleaning the sensor bars does not clear the F-29 code and you are not comfortable using a multimeter to check continuity or working inside the dryer cabinet. A pro can quickly isolate whether the fault is in the sensor, the harness, or the control board and replace only the failed component. If your dryer is still under warranty, contact Whirlpool or an authorized service center before opening the cabinet.