Whirlpool dryer AF error code
- Dryer
Whirlpool dryer AF (also related to F4E3 on some models) means the airflow sensor detected a restricted vent. A full lint screen, crushed flex hose behind the dryer, or a blocked roof cap causes AF long before the heating element fails. Run this check after every load with heavy lint — AF is a fire-safety code, not a random glitch.
Reviewed August 2025 · sources below
Safe to keep using?
No safety issue
This is a status or lock code, not a hardware fault.
2 product recalls may apply
Brand-level matches — verify your model.
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2 product recalls may apply
Brand-level matches — verify your model.
How to fix AF
- Clean the lint screen and vacuum the lint trap housing — waxy residue from dryer sheets builds up inside the slot.
- Pull the dryer forward and inspect the 4-inch flex hose for kinks or crushing against the wall.
- Check the exterior vent hood — the flap should open fully when the dryer runs. Bird nests and lint mats block many roof caps.
- Run a timed dry with the vent disconnected at the wall briefly (indoors only for a test) — if AF clears, the vent run is the problem.
- Replace crushed flex hose and shorten long vent runs over 25 feet equivalent before replacing sensors.
Call a pro when: Call a vent cleaning service if the exterior cap is on the roof or a long run still blocks after DIY cleaning.
Next step
Still having trouble after the code fix?
This code is usually a status or maintenance notice, not proof of a failed part. Try the steps above first; then describe what still isn't working.
Free guided checks · No account required · Don’t open live electrical, gas, or refrigerant equipment
What AF means
Restricted airflow — the lint screen or vent is clogged, crushed, kinked, or has too many turns.
Likely causes
Lint builds up in the filter, hose, or outdoor vent and trips the airflow sensor.
Check: Clean the lint filter, then check the rear hose and outdoor vent flap for lint or a crushed duct.
Est. cost: $0–$0
Too many elbows or a crushed flex hose chokes airflow even after you clean lint.
Check: Run the dryer and confirm air is blowing outside. Shorten or replace crushed duct.
Est. cost: $0–$40
Guided repair checklist
Complete the safe checks one at a time. Progress is saved for this browser so you can continue later.
0 of 5 checks recorded
Recommended next action
Start with this check before considering replacement parts.
Check 1 of 5
Clean the lint screen and vacuum the lint trap housing — waxy residue from dryer sheets builds up inside the slot.
Did the repair resolve the issue?
Restoring repair progress…
Questions about AF
What does AF mean on Whirlpool dryer?
AF means restricted airflow — the exhaust path is blocked or partially blocked.
Is AF the same as F4E3?
On many Whirlpool-built dryers they indicate the same airflow restriction family.
Do I need a part for AF?
Usually no — vent cleaning fixes most AF codes. Replace a crushed hose if needed.
How do I reset Whirlpool AF?
Clear the vent path, unplug 5 minutes, and run a cycle with a clean lint screen.
Whirlpool AF on specific models
Other Whirlpool Dryer codes
Prevent this problem next time
- Clean the lint filter before every load
- Have the vent professionally cleaned about once a year
Sources
Manufacturer meaning
The exhaust is restricted — the dryer cannot vent hot air.
FixApplianceCode guidance
Clean the lint filter and exhaust vent. Do not order a part until airflow is restored.
Source type: Manufacturer
Source: Manufacturer dryer airflow / vent documentation
Last reviewed: 2026-08-24
Repair guidance is for informational purposes only. We do not guarantee that any fix will resolve your issue, and you assume all risk when following these steps. Terms & disclaimer
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