Dryer Taking Too Long to Dry? Check the Vent First

01

Why airflow matters

A dryer needs to push warm, moist air out through the vent. When lint builds up, moisture stays in the drum, drying takes longer and the dryer runs hotter than it should.

Lint is flammable, so a clogged vent is a safety issue as well as an efficiency one.

The fire data backs this up. The U.S. National Fire Protection Association names failure to clean as the leading cause of home dryer fires, at about one-third of them.

Ontario fire departments give the same warning and the same advice: clean the lint screen every load and keep the duct and outside vent clear.

A restricted vent also wears the dryer out. Whirlpool’s installation instructions say a vent run that’s too long will shorten the dryer’s life and cause longer drying times and higher energy use.

A blocked vent is one of the most common reasons a dryer’s thermal fuse blows. That fuse is a safety cut-off, and once it blows the dryer stops heating or won’t start until the fuse is replaced.

If your dryer runs but gives no heat at all, here’s what to check when the dryer won’t heat.

02

Simple checks you can do

Work through these in order. Most take a minute or two.

1. Clean the lint filter, then look past it. Clean the screen before every load. With the screen out, shine a flashlight into the filter housing. Lint packed down there blocks air even when the screen looks clean.
2. Wash the screen if you use dryer sheets. Natural Resources Canada notes that dryer sheets can leave a film on the filter that cuts airflow. Hold the screen under the tap: if water beads up instead of passing through, scrub it with a soft brush and warm soapy water, and let it dry fully before putting it back.
3. Check the hose behind the dryer. Pull the dryer out carefully. The hose should be short, smooth and not crushed against the wall. White plastic or thin foil hoses should be replaced with rigid or semi-rigid metal duct. Fire services and dryer manufacturers both say that, because plastic and foil kink, sag, trap lint and can melt.
4. Do the outside test. Run the dryer on a heated cycle and go to the vent hood outside. You should feel a strong, steady stream of warm air, and the flap or louvres should open fully. Weak airflow means a blockage somewhere between the dryer and the hood. In winter, check that snow or ice isn’t blocking the hood. In spring, look for nests.
5. Look at how the vent is routed. Each bend and every extra metre of duct slows the air. Whirlpool’s charts, for example, cut the allowed length of rigid 4-inch duct by about 10 feet for every 90° elbow. In a basement laundry room, where the duct can run a long way across the ceiling to reach an outside wall, a long or sagging run can be the whole problem.
6. Give the load room, and start with dryer-ready clothes. Overloading stops clothes from tumbling. Dry towels and jeans separately from light items. If clothes come out of the washer soaking wet, the washer may not be spinning properly, and that is a washer problem, not a dryer one.
7. Wipe the moisture sensor. Most sensor-dry models have two metal strips inside the drum, usually near the lint filter. Fabric softener residue on them can make the dryer end the cycle early, so clothes come out damp. Wipe them with a damp cloth.

If your dryer is in a closet, which is common in condos and stacked laundry, the closet also needs enough incoming air.

The City of Toronto’s fire safety guidance points to the manufacturer’s instructions for closet installations, which usually call for a louvred door or vents.

03

Signs of a different problem

If the vent is clear and the dryer still isn’t drying, or it tumbles with no heat at all, the cause is usually inside the dryer:

• No heat at all (standard): a heating element, thermal fuse or high-limit thermostat. Also check the breaker. Standard dryers use a double breaker, and if one half trips the drum can still turn with no heat.
• No heat (gas): an igniter that glows but doesn’t light the burner, or worn gas valve coils. Make sure the gas supply valve behind the dryer is fully open.
• Heats, but cycles end with damp clothes: a dirty or failed moisture sensor, or a cycling thermostat.
• Drum won’t turn, or squeals or thumps: a broken belt, worn drum rollers or idler pulley, or the drive motor.

What these repairs usually cost (the same ranges as our Dryer Repair page, in CAD before HST):

If a thermal fuse has blown, replacing it alone isn’t a fix. The fuse blew because the dryer overheated, usually from a restricted vent, so the airflow needs checking too. We can clean the vent duct at the same visit.

04

When to call a technician

Call a technician if the vent checks out and drying is still slow, if there’s no heat, if the drum won’t turn, or if you noticed any of the warning signs above.

When you book, tell us the brand and model number (usually on a label inside the door rim), whether it’s gas or standard, and whether it’s stacked. It helps us bring the right parts.

We repair dryers across Vaughan, gas models included, and we clean dryer vent ducts too, so the dryer and the vent can be sorted out in one visit. That includes Maytag dryers, Samsung dryers and LG dryers.

Same-Day Service Available. Diagnostic regularly $129, now $99, and always waived when Aria does the repair. You approve the price before any work starts.

Completed repairs come with our 1-Year Parts & Labour Warranty.