KitchenAid F28 — F28 disables Auto Dry when the moisture sensor bars read invalid — often just softener residue.

This guide explains the Kitchenaid Dryer F28 Error: what it means, what causes it, and how to resolve it safely.

Understanding the Kitchenaid Dryer F28 Error

Below, our specialists break down everything you need to know about the Kitchenaid Dryer F28 Error.

Understanding the Kitchenaid F28 Error

Below, our specialists break down everything you need to know about the Kitchenaid F28 Error.

What F28 means on your KitchenAid dryer

Auto Dry settings on KitchenAid dryers depend on two thin metal contact bars inside the drum to judge how damp your laundry still is. As clothing tumbles past them, the control board reads the changing signal between the bars to decide when the load is dry. A KitchenAid F28 error means that signal has become invalid — the board can no longer trust what the moisture bars are reporting, so it disables Auto Dry rather than risk ending a cycle at the wrong time.

Importantly, temperature-based cycles keep working normally even with F28 present, since they don’t rely on the moisture bars at all — it’s specifically the Auto Dry feature that’s affected, which is a useful distinction when deciding how urgently to address the problem.

Symptoms

• F28 appears on the display, often alongside Auto Dry cycles ending oddly
• Auto Dry stops working reliably, either finishing early or running far too long
• Timed Dry and other non-sensor cycles continue to function normally
• You use fabric softener sheets regularly and haven’t cleaned the sensor bars in a while
• Clothes occasionally come out with a residue smell tied to over-drying

Common causes

• Fabric softener sheets have left a waxy residue coating the sensor bars, insulating them so they can’t detect moisture accurately even when clothes are still wet — by far the most common and most fixable cause.
• The metal sensor bars themselves have been scratched, bent, or broken by a zipper, metal button, or broken spring tumbling in the drum, physically damaging their ability to read correctly.
• The wiring to the sensor bars has broken at the bulkhead connection, either from corrosion or years of flexing.

Troubleshooting steps you can try

1. Unplug the dryer as a precaution before reaching into the drum area.
2. Open the door and locate the two thin metal strips just inside the drum opening on the front bulkhead. Wipe them clean with a soft cloth dampened with rubbing alcohol to strip off any fabric softener residue, then let them dry fully before closing the door.
3. Restore power and run a load on Auto Dry — this cleaning step alone resolves the majority of F28 occurrences, especially for regular fabric softener sheet users, and is worth making a monthly habit.
4. If the problem persists, switch temporarily to Timed Dry cycles, adjusting the time manually for load size and fabric type, until service can be scheduled.

When to call a technician

Certain dryer conditions are not safe or practical to fix yourself — call a professional if:

If you’re a frequent fabric softener sheet user, ask the technician about switching to liquid softener or dryer balls going forward, since that simple habit change is often enough to keep the sensor bars from fouling again after the repair is complete.

Persistent F28 problems on a dryer are best handled by a specialist with the right parts. Book online, browse the error-code database, or see kitchenaid.com.