You throw in a load of towels. Set the timer for the usual 45 minutes. Come back and they’re still damp. Run it again. Still not quite right. By the third cycle, you’re annoyed — and starting to wonder whether the dryer is on its way out.
Before you start shopping for a replacement, stop. Because in the majority of cases, a dryer that’s suddenly taking significantly longer than it used to is not a dying appliance. It’s a blocked vent.
It’s one of the most common home maintenance problems we see across Perth — and one of the most consistently misdiagnosed, because the symptom looks exactly like a mechanical failure when the cause is usually something entirely different.
Here’s how to tell the difference, what to check first, and when the vent is actually the problem.
Why Does a Blocked Vent Make Drying Take Longer?
Your dryer needs two things to work properly: heat and airflow. Take away either one and the clothes don’t dry.
Here’s exactly what happens when the vent blocks up:
- The heating element warms the air inside the drum — this part still works fine
- That warm air absorbs moisture from the clothes — this also works as normal
- The fan tries to push that moist air out through the vent duct — this is where the problem is
- If the vent is blocked, the moist air can’t escape — it backs up inside the drum
- The clothes sit in warm, damp air instead of warm, dry air — and they stay wet
- The dryer keeps running cycle after cycle — trying to do a job the blocked vent won’t let it finish
The dryer isn’t broken. The heating element is fine. The drum is spinning. It just has nowhere to push the moisture — and no amount of running time fixes that until the vent is cleared.
The result: loads that take 90 minutes instead of 45. Two full cycles instead of one. A machine that seems like it’s dying when the actual problem costs nothing to diagnose and relatively little to fix.
What Are the Signs the Vent Is the Problem — Not the Dryer Itself?
How Do I Know If It’s the Vent or a Mechanical Issue?
There’s a quick test you can do right now before calling anyone.
Run the dryer on a heated cycle, then go outside to the exterior vent cap on your wall. Feel the air coming out.
- Strong, warm airflow pushing the flap open → vent is probably clear — the problem is likely mechanical
- Weak airflow, cool air, or flap barely moving → vent is restricted — that’s almost certainly your answer
Other signs that point directly to the vent — not the dryer:
| Sign | What It Means |
| Clothes come out hot but still damp | Heat is working — but moisture can’t escape |
| Laundry room feels warm or humid while running | Moist air is backing up into the room instead of exhausting outside |
| Outside of the dryer feels very hot at the back | Heat is building up inside with nowhere to go |
| Very little lint on the lint screen | Reduced airflow means lint isn’t being pulled onto the screen properly |
| Burning smell during operation | Lint inside the duct is being scorched by backed-up heat — stop the dryer immediately |
If you smell burning from the laundry while the dryer runs — stop the cycle immediately. Do not start another load. Scorched lint inside a vent duct is one step from ignition. Get the vent inspected before using the dryer again.
What Causes Dryer Vents to Block in Perth Homes?
Why Do Perth Dryer Vents Clog Faster Than Expected?
Lint accumulation. This is the primary cause everywhere — lint sheds from clothes on every drying cycle and accumulates progressively inside the vent duct. Perth’s concentrated winter dryer use, when outdoor drying is impractical for several months, accelerates this buildup during exactly the period when dryers work hardest.
Longer or more complex duct runs. Perth’s newer suburban homes — including those in Ellenbrook, Alkimos, Baldivis, and Brabham — tend to be larger, with laundries sometimes located further from an exterior wall. Longer duct runs with more bends accumulate lint faster than short, straight runs. Each bend in a duct is approximately equivalent to adding an extra metre of duct length in terms of airflow resistance — and a duct with four 90° bends is working significantly harder than a straight run of the same length.
Bird nests and pest entry. Perth’s native bird population actively investigates dryer vent openings as nesting sites. A nest inside the exterior vent cap can partially or fully block airflow, and because the cap is on an external wall that rarely gets looked at, it can sit there for months before the homeowner notices the symptoms inside.
Flexible plastic or foil ductwork. Many older Perth homes — particularly those built in the 1970s through 1990s in suburbs like Balga, Nollamara, and Gosnells — have original dryer vent ducts made from flexible plastic or foil material. These materials kink, sag, and crush more easily than rigid metal ductwork, creating lint traps at every bend and low point. Australian standards now recommend rigid metal ductwork for dryer vents, but flexible plastic and foil remain in many established Perth homes.
Incorrect installation. A duct that wasn’t installed properly — with too many bends, running too long without support, or terminating in the wrong location — creates airflow resistance from day one and accumulates blockages faster than a correctly installed system.
Could It Actually Be a Mechanical Problem?
The vent is the most common cause of slow drying, but not the only one. If you’ve confirmed good airflow at the exterior vent and the dryer is still significantly slow, these are the other possibilities worth considering.
Overloaded drum. A drum that’s too full doesn’t allow clothes to tumble freely, which means they clump together and hot air can’t circulate around them evenly. Reduce load size and test again.
Incorrect cycle settings. Air fluff, no-heat, or energy-saving modes dry significantly more slowly than standard heated cycles. Confirm the cycle is set to a standard heated timed dry for troubleshooting purposes.
Lint trap buildup. The removable lint screen catches most lint before it enters the duct, but residue from dryer sheets and fabric softener builds up on the screen mesh over time and reduces airflow even when the screen looks clear. Wash the screen with warm soapy water and a soft brush, rinse thoroughly, and allow to dry completely before reinstalling.
Heating element issues. If the dryer is tumbling normally but producing minimal heat — the air inside feels barely warm — the heating element may be failing. This is a repair job requiring a qualified appliance technician, not an HVAC service.
Thermal fuse failure. The thermal fuse is a safety device that cuts heat if the dryer overheats. A failed thermal fuse can cause the dryer to run without heating at all. If the dryer was getting very hot before the slow drying started, a failed thermal fuse is worth checking. This also requires an appliance technician.
What Should You Actually Do?
What Are the Steps to Take When Your Dryer Is Taking Too Long?
Step 1 — Check the lint screen. Remove, clean thoroughly (wash if needed), and reinstall. Always the first check.
Step 2 — Test exterior airflow. Run the dryer on heated cycle and check the external vent cap for airflow. Weak or absent airflow = vent restriction.
Step 3 — Check the duct behind the dryer. Pull the dryer out slightly and confirm the flexible duct hose connecting the dryer to the wall isn’t crushed, kinked, or disconnected. A kinked hose is one of the most common quick fixes.
Step 4 — Check the load and settings. Reduce load size, confirm heated cycle is selected, and test again.
Step 5 — Book a professional vent clean. If exterior airflow is weak and the duct behind the dryer isn’t obviously kinked, professional vent cleaning with rotary brush equipment clears lint buildup from the full duct run — including the sections inside the wall or ceiling that a household brush kit can’t reach.
Conclusion
A dryer that’s suddenly taking twice as long is almost always telling you something specific, and in the majority of Perth homes, that something is a vent that needs cleaning. The fix is straightforward. The alternative — continued operation with a restricted vent — is both inefficient and, if lint in the duct reaches ignition temperature, genuinely dangerous.
Check the exterior airflow first. If it’s weak, book a vent clean before the next load.