Updated July 17, 2026
1. Loads take longer to dry
A clear change in drying time is one of the most noticeable performance clues. If the same type of load now needs another cycle, airflow may be restricted. Check the lint screen first, then consider the exhaust route and the appliance itself.
2. The dryer or laundry area is unusually hot
Restricted exhaust can trap heat. Stop and investigate if the appliance, clothing or surrounding room becomes much hotter than normal. Do not block ventilation around the dryer.
3. The exterior flap barely opens
Toronto Fire Services advises regularly checking the outdoor flap while the dryer operates. From a safe ground-level position, you may be able to see whether it opens. Do not climb or reach into a moving or hot system.
4. Lint collects near the outdoor outlet
Visible lint around the termination can indicate that material is travelling through the route or collecting at the outlet. The cover may also be obstructed by vegetation, snow or an animal guard.
5. There is a burning or musty odour
A burning smell needs prompt action: stop using the dryer. A musty smell can have several causes, including moisture or an exhaust problem. Do not assume cleaning alone is the remedy.
6. The dryer stops or shows airflow errors
Some appliances detect heat or airflow conditions and change the cycle. Consult the owner’s manual for the exact code. A qualified provider can determine whether the vent is involved.
7. It has been more than a year since inspection
Natural Resources Canada advises inspecting and cleaning the exhaust duct and outside vent at least annually. If you do not know the last service date—common after moving into a home or condo—an assessment can establish a baseline.
Safe checks you can do
- Clean and inspect the lint screen
- Note whether the symptom occurs with every load
- Look for a crushed visible connector without moving a heavy appliance
- Observe the outdoor flap only from a safe location
- Read the appliance manual and record any error code
- Ask condo management for vent responsibilities and records
Cleaning may not be the only answer
A crushed connector, disconnected concealed duct, stuck exterior cover, failed booster fan or appliance fault can mimic lint restriction. Ask the provider to describe the finding and separate any repair recommendation from routine cleaning.