Also printed as Check Vent
Fix at homeAirflow restricted
The dryer measured too little air moving through the drum for the heat it was making, so it cut the heat back. Nine times in ten the vent run is the cause, not the dryer. A model with no display lights Check Vent for the same thing.
- The lint screen is clean, and water poured on it runs straight through — a screen glazed by dryer sheets holds air back even when it looks clean.
- Pull the dryer out and look at the hose to the wall: no kinks, not crushed flat behind the machine, metal (foil or rigid) and never white plastic.
- Take the hose off the back of the dryer and run a Timed Dry on high for a minute. Strong warm air at the dryer's outlet means the dryer is fine and the duct in the wall is the problem.
- Outside, the hood flap lifts when the dryer runs. A flap stuck with lint, a bird's nest or a screen over the hood stops the air.
- A duct run over about 35 feet, or with more than two elbows, is too long for the dryer — each 90° elbow counts as five feet.
Clean the duct end to end (a drill-driven brush kit reaches most runs), replace a crushed or plastic hose with rigid or semi-rigid metal, and clear the hood; the code clears once the air moves. A dryer that prints AF with the hose off its back and a clean screen has a blocked blower housing or a stuck airflow sensor inside — a service call.
