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Error code reference

Kenmore Dryer Error Code AF

Restricted air flow condition exists.

Kenmore codesKenmore dryer codes

Restricted air flow condition exists.

First step from the service manual

Check to make sure the lint screen is clean, the door seal is in place and the vent is not obstructed.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What AF means on a Kenmore dryer

The AF error code on a Kenmore dryer indicates a restricted airflow condition. The dryer's control system monitors airflow through the drum and exhaust path, and when it detects insufficient air movement, it triggers this code to prevent overheating and potential fire hazards. Proper airflow is critical to the dryer's ability to remove moisture-laden air from the drum and exhaust it safely to the outside.

The most common causes of the AF code are blockages at one or more points along the airflow path: the lint screen, the door seal, the internal duct work, and the external exhaust vent. A heavily loaded lint screen is typically the first place to check, as even a partially clogged screen significantly reduces the volume of air moving through the system. A damaged or displaced door seal can also disrupt the pressure differential the dryer relies on to pull air through the drum correctly.

If the lint screen and door seal check out, the problem likely lies further along the exhaust path. The vent duct running from the back of the dryer to the exterior termination point can accumulate lint over time, especially at bends and connections. Long duct runs, crushed flexible duct, or a clogged exterior vent cap are all frequent culprits. In some cases, birds or small animals may have built nests inside the exterior vent hood, creating a near-total blockage that restricts exhaust airflow significantly.

Source: manufacturer service documentation.

Common causes of AF

  1. 01

    Clogged lint screen

    Wiring / connection

    A lint screen that has not been cleaned recently can become heavily coated, sharply reducing airflow through the drum. Remove and inspect the screen, clean it under running water if a fabric softener film is present, and allow it to dry before reinstalling.

  2. 02

    Blocked or kinked exhaust vent duct

    Wiring / connection

    Lint buildup inside the duct, a crushed flexible section, or a sharp bend can restrict exhaust airflow enough to trigger the AF code. Disconnect the duct from the back of the dryer and inspect its full length for blockages, crushing, or excessive bends.

  3. 03

    Clogged exterior vent termination

    Wiring / connection

    The cap or hood where the exhaust exits the home can accumulate lint, debris, or animal nests that block the opening. Check the exterior vent opening and clear any obstruction, and confirm the flap or damper opens freely during dryer operation.

  4. 04

    Damaged or displaced door seal

    Part replacement

    If the door gasket is torn, missing, or not seated correctly, the dryer cannot maintain the airflow pressure needed to move air through the system properly. Inspect the door seal around its full perimeter for gaps, tears, or areas that are no longer making contact with the drum opening.

  5. 05

    Excessively long or improper vent duct installation

    Part replacement

    Duct runs that exceed the recommended length, use too many elbows, or use accordion-style flexible duct throughout can cause chronic airflow restriction even without a specific blockage. This typically requires a duct rerouting or upgrade to smooth rigid metal duct to resolve.

See the test procedure for each cause

Frequently asked questions about AF

What does AF mean on a Kenmore dryer?
AF stands for restricted airflow condition. The dryer's control system has detected that air is not moving through the appliance at the level required for safe, efficient operation. This is most commonly caused by a clogged lint screen, a blocked exhaust vent duct, or an obstructed exterior vent cap. Addressing the blockage will typically clear the code and restore normal operation.
How do I fix the AF error code on my Kenmore dryer?
Start by cleaning the lint screen and checking that the door seal is properly in place and undamaged. Then inspect the exhaust duct running from the back of the dryer to the outside for lint buildup, kinks, or crushing. Finally, go outside and check that the exterior vent termination cap is clear of lint, debris, or animal nests and that its flap opens freely. If all of these components are clear and the code persists, the duct installation itself may need to be evaluated for excessive length or improper fittings.
Is it safe to keep running my Kenmore dryer when the AF code is showing?
It is not recommended to continue running the dryer while the AF code is active. Restricted airflow causes heat to build up inside the drum and exhaust path, which increases the risk of overheating and lint ignition. The dryer may also shut down mid-cycle to protect itself. Resolve the airflow blockage before resuming normal use.
Will resetting my Kenmore dryer clear the AF code?
A reset may temporarily clear the AF code from the display, but the code will return if the underlying airflow restriction has not been corrected. To permanently resolve the error, you need to identify and remove the blockage in the lint screen, vent duct, or exterior vent cap. Resetting without fixing the root cause also leaves the overheating risk in place.
How much does it cost to fix an AF error code on a Kenmore dryer?
If the cause is simply a clogged lint screen or an obstructed exterior vent, the fix costs nothing beyond your time. Professional dryer vent cleaning services typically run between $80 and $180 depending on duct length and accessibility. If a damaged door seal needs replacement, parts and labor can range from $50 to $150. A full duct replacement or rerouting by a professional can cost between $150 and $400 or more depending on the complexity of the installation.

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