The Whirlpool WED9620 tells you when airflow is restricted with an AF or Check Vent message on the display. Whirlpool's own article says it means the lint screen or vent is clogged, or the vent is crushed, kinked or has too many turns; the dryer keeps running while it shows and any key clears it. Whirlpool's separate vent article adds a physical test, taking out the lint screen and feeling for airflow with the dryer set to Air Dry, and sells a dryer vent testing kit, part W11224254, for measuring it.
Differential
Likely causes of “Whirlpool dryer shows a vent, airflow or blockage warning”, and how to tell them apart
- 1
Lint packed in the vent or the outside hood
What separates it AF or Check Vent shows and drying takes several cycles
How to confirm Disconnect and clean the vent and clear the hood
- 2
A crushed or kinked vent behind the dryer
What separates it The vent was pushed back when the dryer was moved
How to confirm Pull the dryer forward, straighten or replace the vent, and check the length
- 3
A vent run that is too long or has too many turns
What separates it The message appears from the first loads on a new installation
How to confirm Compare the run with the Vent System Chart and shorten it
- 4
Nesting animals or debris at the exterior hood
What separates it Little lint on the screen and no air felt at the hood
How to confirm Clear the hood so the flap opens freely, at least 12 inches from the ground
Before you touch a setting
Record this first — changing settings destroys the evidence
- Whether AF or Check Vent shows on every cycle or only some
- The vent type, length and number of elbows
- Whether air is felt at the outside hood while the dryer runs
Try in this order
0 of 5 completedClean the lint screen
ReversibleTake out the screen, roll off the lint and wash it if softener residue has built up. A blocked screen is the simplest cause of AF or Check Vent.
Feel the airflow
ReversibleWith the screen removed and the dryer set to Air Dry or Air Fluff, place your hand in the lint trap area: airflow means the house vent is probably clear, little or none means it is probably restricted. This applies to models with the screen on top.
Check the hood outside
ReversibleRun the dryer for 5 to 10 minutes and hold your hand under the outside exhaust hood. The hood must be at least 12 inches (305 mm) from the ground or anything that could block it and the flap must open freely.
Inspect the vent behind the dryer
ReversibleLook for a crushed or kinked vent, foil or plastic material and lint build-up. Use only 4 inch heavy metal vent, with the straightest, shortest run.
Test and clean
ReversibleUse Whirlpool's dryer vent testing kit, part W11224254, or a professional vent cleaning service. Clean the vent every one to two years or when drying slows.
Model-specific
What is true of this model and not of its siblings
- Accessories for the vent
- Whirlpool's Owner's Center for the WED9620HW lists a 4 inch elbow vent connector (4396006RW), a 5 foot snap-lock metal exhaust duct (4396009RP), a 4 foot silver flexible vent kit with close-quarter elbows (4396028), a 5 foot flexible vent hose (4396033RP) and dryer exhaust periscope kits for close clearances (4396013RB and 8171587RP), plus the W11224254 vent testing kit.
- Parts for this problem on the WED9620 (RepairClinic, 2026-09-21)
- dryness sensor bar, part number WP3387223, at $12.03; dryer lint screen (filter), part number W11758174, at $36.94.
- Other models this page answers
- These steps also fit models WED8620, WED6605, WED5605, WED5050, WGD9620, WGD5050, WHD560CHW.
Stop boundary
When this stops being a self-service repair
- !If Check Vent persists after cleaning the screen and vent, have a professional vent cleaning service inspect the run
- !If there is a burning smell or water behind the dryer, stop using the dryer until the vent is cleared
Evidence ledger
Sources behind this answer
Whirlpool's own help articles for its dryers, each; the article for this page is named in the page's notes.
Whirlpool's own product-assistance articles for dryers, including the Dryer Vent Testing Kit (part W11224254).
Whirlpool's own page for this model, listing its manuals and guides and the accessories sold for it.
Whirlpool's quick start guide for its dryers: Start/Pause held for 1 second, sensor and timed cycles, Wrinkle Shield, Static Reduce and Mute Cycle Signal.
Parts and list prices as shown on RepairClinic's parts search for this model number on 2026-09-21.
Exact questions
Common questions
What does AF mean on a Whirlpool dryer?+
Restricted Air Flow. It means the lint screen or vent is clogged or the vent is crushed, kinked or has too many turns.
Does the dryer stop when it shows Check Vent?+
No. It keeps running; touch any key to clear the message and return to the estimated time remaining.
How do I test my vent?+
Feel for airflow with the screen out on Air Dry, check the outside hood, or use Whirlpool's dryer vent testing kit, part W11224254.
What if water drips behind the dryer?+
It can be moisture from a restricted vent collecting in the venting. Clear the vent.
Can I use flexible foil vent?+
Whirlpool recommends rigid or flexible metal vent and advises against foil or plastic because they collapse easily.
How often should I clean the vent?+
Every one to two years or as needed when drying performance has dropped.
Who can clean it?+
You can, or a professional vent cleaning service can clean and inspect it.