A blocked dryer vent rarely announces itself dramatically — it creeps up as the lint slowly accumulates, until the dryer is working twice as hard and the warning signs become obvious. Recognising those signs early lets you clear the vent before it becomes a fire risk or starts driving up your power bills. This guide covers the signs of a blocked dryer vent in a Melbourne home, what each one means, and how urgently to act.
Why Dryer Vents Block
Dryer vents block because of lint — the fine fibres shed from clothes as they dry. The lint screen catches some of it after every load, but a significant amount of finer lint passes through and travels into the vent duct, where it settles on the duct walls, gathers at bends, and collects around the external discharge cover. Over months and years this buildup compounds, gradually narrowing the duct until airflow is badly restricted.
Certain setups block faster: long vent runs (common with internal Melbourne laundries), runs with several bends, ribbed flexible ducting that catches lint in every ridge, and heavy dryer use through the damp winter. Whatever the setup, the result is the same — a restriction that the warning signs below reveal.
Clothes Taking Longer to Dry
The most common and earliest sign of a blocked vent is clothes taking longer to dry — a load that used to dry in one cycle now needing a second, or coming out still damp. This happens because the restricted vent cannot carry moisture out of the dryer efficiently, so the machine has to run far longer to shift the same amount of water.
Longer drying times are easy to dismiss as the dryer getting old, but they are usually the vent, not the machine. As well as being inconvenient, the extra running time directly increases your electricity costs — a clogged vent quietly makes every load more expensive. See our guide to a dryer that takes too long.
A Hot Dryer or Laundry
If the dryer itself, or the whole laundry, gets unusually hot during a cycle, the vent is likely restricting airflow. A dryer expels heat along with the moist air; when the vent is blocked, that heat cannot escape and builds up in the machine and the room instead. The top of the dryer becoming hot to touch, or the laundry feeling like a sauna, is a clear sign.
This overheating is more than uncomfortable — it is the dangerous part of a blocked vent. Excess heat combined with trapped, flammable lint is exactly the condition that causes dryer fires. A dryer that runs very hot should be treated as a vent that needs clearing urgently. See our fire safety guide.
A Burning Smell
A burning or hot smell when the dryer runs is a serious warning sign. It can be the smell of lint overheating against the hot components of an under-ventilated dryer — a direct indicator that the vent is blocked and the machine is running too hot. Stop using the dryer, clean the lint screen, and check the vent and the space behind the dryer for lint buildup.
Do not run the dryer unattended while a burning smell is present, and have the vent cleared before using it again. If the smell is distinctly electrical, or you see scorching, smoke or sparks, switch the dryer off at the power point and have it inspected. A burning smell is the dryer’s clearest signal to stop and check.
Lint and Weak Discharge Outside
You can check a dryer vent from outside while the dryer runs. With the dryer on, there should be a strong flow of warm air from the external vent. If little or no air is coming out, the vent is blocked somewhere along its run. Lint visible around the external vent cover, or the cover flap not opening when the dryer runs, are further signs of a blockage at the discharge.
Behind the dryer, visible lint around the duct connection, or lint accumulating on surfaces in the laundry, also points to a vent that is not carrying the lint away properly. These external and behind-the-dryer checks are a quick way to confirm a suspected blockage.
Moisture, Condensation and Mould
Because a vented dryer releases litres of water as vapour, a blocked or disconnected vent shows up as moisture in the laundry: condensation on windows and walls when the dryer runs, a persistently damp or musty laundry, or mould developing in the room. The moisture that should be leaving the building is staying inside.
In Melbourne’s humid winter this happens quickly and compounds the general dampness of the season. If your laundry is damp or mouldy and it coincides with dryer use, check whether air is actually flowing from the external vent — if not, the moist air is being released indoors and the vent needs attention. This is also a reason a dryer must be vented outside in the first place. Call FreshDuct on 0431 918 137 to have a blocked vent cleared.