Short answer: the most common cause is a clogged or crushed dryer vent. When hot, damp air cannot escape, the clothes stay wet and the dryer runs longer and hotter. Clean the lint screen, check that the duct behind the dryer is not crushed, and see whether the outside flap opens when the dryer runs. If it barely moves, the vent likely needs cleaning.
Quick checks you can do
- Clean the lint screen and wash it with soap and water if it looks coated.
- Pull the dryer out and look for a crushed, kinked or disconnected duct.
- Go outside while the dryer runs. You should feel strong, warm airflow and see the flap open.
- Check the load size. Overloading slows drying.
- Check the washer spin. Clothes that come out very wet take longer to dry.
Common causes
Clogged dryer vent
Lint builds up inside the vent over time, especially at bends and in long runs. This is the most common cause, and it is also a fire hazard. See the signs of a clogged dryer vent.
Crushed or kinked duct
Pushing the dryer back against the wall can flatten a foil duct. Read foil vs metal dryer duct.
Blocked outside hood
Lint, nests or snow can block the flap outside.
Long vent run
Condo and townhouse vents often run a long way, which slows airflow and clogs faster.
Dryer problems
A failing heating element, thermostat or sensor can also cause slow drying. If the vent is clear and the dryer still struggles, call an appliance technician.
Frequently asked questions
Is it dangerous to keep using a slow dryer?
If the cause is a clogged vent, yes. Lint near heat is a fire hazard. Get the vent checked before you keep running long cycles.
Why are my clothes hot but still damp?
That usually points to poor airflow: the heat is there, but the moist air cannot get out.
Will cleaning the vent fix it?
If the vent is the cause, yes, and most people notice faster drying right away.
How often should the vent be cleaned?
At least once a year. Read how often to clean your dryer vent.
My condo dryer has always been slow. Can anything help?
Often, yes. Long condo vents collect lint quickly, and a full cleaning can make a big difference. Read condo dryer vent cleaning.
Slow dryer in Richmond Hill, Aurora, Newmarket, Vaughan or Toronto? See dryer vent cleaning or call UltiClean at 647-676-0576.
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