Whirlpool · Dryer

AF

Restricted Airflow

Severity

High

Seeing AF on your Whirlpool Dryer display means the appliance self-diagnostic detected "Restricted Airflow". Before calling a technician, work through the steps in this guide — the fix is often simpler than you think.

Owner's Summary

Your dryer is telling you the air can't flow through properly. This is the most important dryer warning to take seriously — a clogged dryer vent is a leading cause of house fires in the US. Clean the lint trap and the full duct run immediately.

Symptoms

Whirlpool dryer taking too long to dry clothes, AF code, clothes still damp

Common Causes

Lint screen not cleaned before every cycle
Exhaust duct clogged with lint buildup
Exhaust duct too long or has too many bends
Bird nest or debris blocking outdoor vent cap

How to Fix

1 Clean the lint screen thoroughly before every load
2 Disconnect and clean the entire exhaust duct from machine to outside wall
3 Check outdoor vent cap and clear any debris or bird nests
4 Ensure duct run does not exceed 35 feet equivalent length
5 Replace damaged or crushed flexible duct with rigid metal duct

Tools You'll Need

Soft Brush

Most of these fixes need only basic hand tools. If your repair requires opening electrical housings or testing live components, a multimeter and basic electrical safety knowledge are essential — when in doubt, call a technician.

Technical Explanation

Modern Whirlpool dryers measure airflow through exhaust temperature differential and moisture sensor readings. When the differential exceeds programmed thresholds, indicating poor airflow, the CCU posts AF and may reduce heat output.

Is It Safe to Keep Using?

This is a fire safety issue — address immediately. Do not run additional cycles until the vent is cleaned.

Technician's Pro Tip

The leading cause of dryer fires is lint accumulation in the exhaust duct, not the lint screen. Use a dryer vent cleaning brush kit annually to clean the full duct length, not just the trap.

Related Codes

F21 — Whirlpool Washing Machine

Long Drain Time or Drain Pump Fault

High

F20 — Whirlpool Washing Machine

No Water Detected

High

F7E1 — Whirlpool Washing Machine

Motor Speed Sensing Error

High

Frequently Asked Questions

What does error code AF mean on a Whirlpool Dryer?

Code AF on a Whirlpool Dryer indicates "Restricted Airflow." In practice, the most common trigger is lint screen not cleaned before every cycle. Severity is rated high, and typical repair costs range from $0 to $200.

Can I fix AF myself, or do I need a technician?

Many cases of AF can be resolved without a technician. The first step to try: clean the lint screen thoroughly before every load. If that doesn't clear the code, work through the remaining steps in the "How to Fix" section above before assuming a part needs replacing.

Is it safe to keep using my dryer with code AF showing?

This is a fire safety issue — address immediately. Do not run additional cycles until the vent is cleaned.

How much does it cost to repair AF on a Whirlpool Dryer?

Repair costs for code AF typically range from $0 to $200. Lint screen cleaning: $0; Duct cleaning kit: $20–$40; Professional cleaning: $100–$200. Costs on the low end usually reflect a DIY fix with no parts required, while the high end reflects a part replacement plus professional labor.

Estimated Repair Cost USD

$0 – $200

Lint screen cleaning: $0; Duct cleaning kit: $20–$40; Professional cleaning: $100–$200