Longer drying times
If a load that used to take 40 minutes now takes an hour or more, that's usually the clearest sign. Airflow restriction forces the dryer to work harder and longer to get the same result.
The dryer runs hotter than usual
Reduced airflow can cause heat to build up rather than vent out properly. If the outside of the dryer or the laundry area itself feels warmer than normal during a cycle, that's worth checking.
Clothes come out hotter or slightly damp
Even after a full cycle, clothes that feel unusually hot to the touch or aren't fully dry can point to airflow struggling to do its job.
A burning or musty smell
A burning smell can mean lint is close to a heat source and should be addressed right away. A musty smell often means moisture is getting trapped instead of venting out, which can also point to buildup.
The lint screen fills up faster than it used to
If lint is showing up on the screen in larger amounts more frequently, it may mean more lint is being generated or trapped somewhere further along than before.
Visible lint outside the dryer
Lint appearing on the floor, around the outlet, or near the vent opening on the outside of the house is a sign air isn't moving through as freely as it should.
What to do if you notice these signs
Start with the accessible area — the lint screen and the opening just past it. A flexible reach tool such as DeepReach can loosen and remove buildup in that space. If signs continue after that, or if the smell, heat, or airflow issues seem unusual or severe, it's worth calling a professional rather than continuing to troubleshoot on your own.
FAQ
Is one sign enough to worry about, or should I wait for more?
Any single sign is worth checking, especially longer drying times or unusual heat. Waiting for multiple signs to show up usually means more buildup has had time to accumulate.
Can these signs mean something other than lint buildup?
Yes, in some cases. A worn belt, a failing thermostat, or an issue with the outlet itself can cause similar symptoms. If cleaning the accessible area doesn't help, that's a signal the cause may be mechanical rather than buildup-related.
How quickly should I act on a burning smell specifically?
Right away. Stop using the dryer until the source has been identified. This is one sign where waiting isn't the safer option.
Will regular cleaning prevent these signs from happening at all?
It significantly reduces the chances. Most of these signs show up after buildup has been left unaddressed for a while, so a consistent routine is the most reliable way to avoid reaching this point.