How to Clean a Tumble Dryer Lint Filter Properly

Every tumble dryer, whether it's a vented, condenser or heat pump model, has some form of lint filter tucked away inside. It catches the fluff and fibres that come off your clothes as they dry, and it needs emptying after every single cycle. Skip that small job and you'll notice longer drying times, higher energy bills and, in the worst cases, a genuine fire risk as lint builds up where it shouldn't.

The good news is that learning to clean a tumble dryer lint filter takes a couple of minutes and no tools. Below we'll walk through how to do it properly, why it matters so much, and what to check if your dryer keeps nagging you to clean the filter even after you've just done it.

Why a clean lint filter matters

The filter's job is simple: trap loose fibres so they don't clog up the inner workings of the machine. When it gets coated in a thick layer of fluff, air can no longer pass through it freely. That has knock-on effects you'll feel in your washing routine and your wallet.

• Longer drying times. Restricted airflow means damp air can't escape and warm air can't circulate, so clothes take far longer to dry.
• Wasted energy. The dryer works harder and runs longer to achieve the same result, pushing up your electricity use.
• Fire risk. Lint is highly flammable. A filter packed with dry fibres sitting next to a heat source is exactly the sort of thing that causes appliance fires, which is why clearing it after each load is so important.

Clearing the filter after every cycle keeps your dryer efficient and helps it last longer. It's the single most useful habit you can get into with this appliance.

How to clean a tumble dryer lint filter

Most lint filters sit either in the door opening or just inside the drum lip, and they pull straight out. Here's the routine to follow each time.

1. Wait for the cycle to finish and the machine to cool. Open the door and locate the filter.
2. Remove the filter. Pull it out gently. On many machines it lifts or slides free without any clips.
3. Peel away the lint. Wipe the fluff off with your fingers. It usually comes away in one soft sheet.
4. Rinse fine-mesh filters under running water. If your filter has a fine mesh and feels greasy or clogged, hold it under the tap and lightly scrub it clean. Fabric softener and fine particles can clog the tiny pores over time, and water clears them far better than a dry wipe.
5. Dry it fully before refitting. Never put a wet filter back into the machine. Let it air dry completely first.
6. Slot it back into place. Make sure it's seated correctly so no lint can bypass it.

The blow test

Here's a quick way to check whether a filter is genuinely clear rather than just looking clean. Hold it up and gently blow onto one side. If you can feel the air passing through and coming out the other side, the filter is doing its job. If your breath barely makes it through, the pores are still blocked and the filter needs another rinse and scrub.

This matters more than you might think on condenser dryers, which we'll come to next.

When the filter symbol or error code won't go away

Lots of modern dryers display a filter-cleaning symbol, a light or sometimes an error code on the control panel when they think the filter needs attention. Usually you clear the filter, the indication disappears, and you're done. But a common fault on many newer machines is that the warning keeps showing even after you've checked and cleared the filter.

What you see	What it means	Likely causes
Filter-cleaning symbol, light or error code	The machine believes the filter needs cleaning	Blocked fine pores on the filter stopping airflow over the sensor, or lint that has coated the sensor itself and triggered an electronic error

The reason comes down to a small sensor. On most condenser dryers there's a sensor located towards the bottom of the filter housing. Air has to be able to pass through the filter and flow over this sensor. If the fine pores on the filter are blocked, no air reaches the sensor and the machine raises the fault. And if lint has worked its way past the filter and settled on the sensor, the machine reads that as a blockage too, even though the filter itself looks spotless.

Step-by-step: clearing a stubborn filter warning

If you've emptied the filter and the indication is still showing, work through these checks in order.

Step 1: Check air can pass through the filter

Start with the filter itself. Hold it under running water and lightly scrub it clean to clear the fine pores. Then do the blow test described above. If you can feel air coming through the other side, the filter is clear and the problem lies elsewhere.

Step 2: Check the sensor is clear

With the filter removed, look down into the filter housing. You should be able to see the sensor towards the bottom. Lint often creeps past the filter over time and starts to coat this sensor, which is what fools the machine into thinking it's blocked.

Step 3: Clean the sensor

Gently clean any lint or film off the sensor. In most cases, clearing the sensor is enough to make the filter warning on the front of the machine disappear and let your dryer run normally again.

A bit more on condenser dryers

Condenser models have a few extra maintenance points beyond the lint filter, including the condenser unit and the water container. If you own one, it's worth reading our full guide on how to maintain a condenser tumble dryer, and our advice on tumble dryer water container faults and how to avoid them so you can keep on top of the lot.

When to call in an engineer

If you've thoroughly cleaned both the filter and the sensor and the warning still won't clear, or the dryer still isn't drying properly, there may be a deeper fault with the sensor or airflow system that needs a closer look.

That's where we can help. NAC engineers repair tumble dryers across every major make, and we'll quote you a service charge before anyone attends, covering all the labour, callout and VAT where it applies. The only extra would be for parts if any are needed, and we'll always quote those separately before doing the work. Every repair comes with a guarantee, with the length depending on the parts fitted (full details are in our terms and conditions).

You can book a repair or get in touch online, or call us on 0333 016 9622. Take a look at the brands we repair and the services we offer if you'd like to know more before booking.

Keep clearing that filter after every load, give it a proper rinse when it needs one, and your dryer will thank you with shorter drying times and a longer life.