Troubleshooting
Why Is My Dryer Showing a Flow Sense or Airflow Error?
Flow Sense, CheckVent, and similar airflow warnings are the dryer telling you it is working harder than it should to push air through the vent. The cause is almost always a restriction somewhere between the dryer and the outside vent. A free inspection can help identify exactly where.
Common causes
- Lint buildup inside the rigid duct
- Kinked or crushed flex hose behind the dryer
- Bird nest or pest blockage at the outside vent
- Long or undersized duct runs through the attic
- Loose or disconnected duct dumping into the wall cavity
Warning signs to watch for
- Flow Sense bars or CheckVent icon lighting up
- Longer dry times than normal
- Dryer hotter than usual at the end of a cycle
- Humid or warm laundry room
- Lint visible around the outside vent cover
What you can check
- Pull the dryer out and confirm the flex hose is not kinked.
- Clean the lint trap and the lint trap housing.
- Run a heat cycle and check the outside vent flap for steady airflow.
- Look at the outside vent cover for lint pack-out or nesting material.
When to stop using the dryer
If the warning is paired with overheating, burning smells, or the dryer shutting itself off mid-cycle, stop running it until the vent has been inspected. Repeated high-temperature shutdowns are a sign of a serious restriction.
How 210 Dryer Vent Cleaning can help
We test airflow with a manometer and anemometer, inspect the full vent path, and show you the readings before and after cleaning. Most San Antonio homes go from a Flow Sense warning back to a clear reading in a single visit.
Schedule a free dryer vent inspection in San Antonio. We inspect first, explain what we find, and give upfront pricing before work begins.
Related Dryer Vent Help
Frequently Asked Questions
+What does the Flow Sense warning actually measure?
LG and similar brands measure back-pressure in the vent line during a cycle. A higher reading means the dryer is having to push air through a restriction.
+What if my dryer shows CheckVent, AF, or D90?
These are the same family of warnings on other brands — Samsung, Whirlpool, Maytag. They all point to restricted airflow somewhere in the vent system.
+Can I clear the code without fixing the vent?
Resetting clears the display but the warning will return on the next load if the underlying restriction is still there. A vent inspection helps identify the actual cause.
+How long does an inspection take?
About 20–30 minutes for most San Antonio homes. We measure airflow, inspect the duct path, and walk you through what we find.
+What if the warning shows level 1 only?
Level 1 is borderline. It often means buildup is starting. Cleaning at this stage is easier and cheaper than waiting for a level 3 full blockage.
Related Articles
Hand-picked next reads based on this topic.
- Dryer Taking Two Cycles to Dry
#1 sign of a restricted dryer vent.
- Why Is My Dryer Taking So Long?
Root causes of slow drying.
- Weak Airflow Outside the Vent
Almost no air at the exterior hood.
- Not Enough Airflow From the Vent Outside
Diagnose restricted exterior airflow.
- Dryer Vent Not Blowing Outside
Disconnected duct or full blockage.
- Long Dryer Vent Run Problems
Why long runs clog faster.
Need help with your dryer vent?
Schedule a free dryer vent inspection in San Antonio or call/text 210-560-1422.