Whirlpool · Dryer Moderate
F28 — Moisture Sensor Open
The control cannot see the moisture sensor strips inside the drum (open circuit). Automatic / Auto-Dry cycles will not end correctly because the dryer can't tell when the clothes are dry.
- Keep using it?
- Yes, with caution
- DIY difficulty
- Moderate
- Verified against
- atoz1.com ↗
How to fix it
- Unplug the dryer.
- Remove the top panel / front panel per the model service sheet to access the moisture sensor harness.
- Reseat the moisture sensor connector and inspect the wires for breaks.
- Inspect the two metal strips inside the drum near the lint screen — they should be clean and roughly flush.
- Wipe the strips with a soft cloth and rubbing alcohol to remove fabric softener film.
- If wiring and strips are good, replace the moisture sensor harness assembly.
Why it happens
Typical signs: F28 in display · Auto cycles end almost immediately or run forever · Clothes coming out damp on Auto Dry but fine on Timed Dry · Sensor Dry cycles unusable
- Disconnected sensor harness The connector to the moisture sensor strips behind the lint screen housing has worked loose, often from vibration.
- Broken wire Wire chafed or broken where the harness runs into the drum front bulkhead.
- Damaged sensor strips The two metal strips inside the drum are bent away from clothes contact or corroded.
Parts you may need
If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.
- Moisture sensor harness Common replacementAmazon →
More Whirlpool dryer codes
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: atoz1.com.