I was elbow-deep in a greasy, half-clogged unit in a kitchen near Clifton last Tuesday when the homeowner told me the motor had “given up the ghost.” I pulled the grease filters out, and there it was: a thick, stubborn layer of congealed fat so heavy it was practically strangling the fan. Most people think that when an extractor starts making a racket or stops pulling air, you need to shell out hundreds for a new motor, but that’s nonsense. More often than not, servicing an extractor hood is less about electrical engineering and more about simply clearing the path so the machine can actually breathe.

I’m not here to sell you a fancy service contract or a replacement part you don’t need. I’ve spent eighteen years opening up machines that people were ready to scrap, and I can tell you that proper maintenance is usually just a bit of elbow grease and the right cleaning solution. In this guide, I’m going to show you exactly how to strip down your filters, clear the grease buildup, and keep that motor running smoothly without calling in a professional.

Step-by-Step Instructions

• 1. Before you even think about touching a screwdriver, you need to cut the power. I don’t care if you think you’ve switched the knob to ‘off’; if you’re poking around near the motor or the wiring, you want that circuit breaker flipped at the main board. I’ve seen enough people get a nasty jolt because they thought a light switch was enough protection, and nobody wants that.
• 2. Pop those grease filters out first. Most modern ones just click out, but older ones might have a little latch you need to nudge. Take them over to the sink and soak them in hot water with a decent amount of degreaser. If you’re lucky, they’re metal mesh; if they’re the disposable paper kind, don’t bother cleaning them—just throw them away and get new ones. I’ve spent far too many afternoons scrubbing mesh that was beyond saving.
• 3. Once the filters are soaking, grab a torch and look up into the cavity. You’re looking for the buildup of “gunk”—that sticky, amber-coloured sludge that happens when fat meets dust. Use a soft brush or a cloth dampened with warm soapy water to wipe down the interior surfaces. You want to be careful around the fan blades; you don’t want to bend anything or knock a wire loose while you’re being thorough.
• 4. Now, let’s look at the motor and the fan. If you can reach it, check the fan blades for any heavy accumulation of grease. If the blades are weighted down with fat, the motor has to work twice as hard to spin them, which is exactly how you burn out a motor that was perfectly fine to begin with. A quick wipe with a damp cloth is usually all it takes to get the balance back.
• 5. Check your ducting. This is where most people fail. If your hood vents to the outside, follow the hose from the motor to the wall. Give it a gentle squeeze; if it feels soft or crunchy, it’s likely clogged with grease or has a hole in it. A blocked duct means the air has nowhere to go, which puts unnecessary strain on the whole system. If it’s a mess, replace the hose—it’s a cheap part that saves a very expensive machine.
• 6. While you’ve got the hood open, take a look at the light fittings. If they’re halogen or old-fashioned bulbs, check the sockets for any signs of heat damage or grease ingress. Clean the glass covers thoroughly; a dirty bulb doesn’t just look bad, it traps heat and can lead to the casing becoming brittle over time.
• 7. Put it all back together, but don’t rush the final step. Once the filters are dry and the grease is gone, slide them back in and ensure they are properly seated. If they’re loose, they’ll rattle every time you turn the fan on, and you’ll be convinced the motor is failing when it’s actually just a poorly fitted piece of metal. Turn the power back on, flick the switch, and listen. It should sound smooth and steady.

Understanding Servicing an Extractor Hood

When people call me out because their kitchen feels like a sauna after cooking, it’s rarely a mechanical failure. Usually, it’s just a lack of basic upkeep. Most folks think an extractor is a “set and forget” appliance, but if you aren’t cleaning grease filters at least once a month, you’re essentially asking for trouble. That sticky yellow film isn’t just unsightly; it’s a fire hazard and the primary reason your extractor hood suction power starts to drop off a cliff.

I’ve pulled apart enough units to know that the real damage happens when grease migrates from the mesh into the internal housing. If you have a recirculating model, you also need to keep an eye on replacing charcoal filters every few months. If those get saturated, the air just swirls around the room instead of actually being scrubbed. It’s not about complex engineering; it’s about preventing the buildup from reaching the parts that actually matter. If you keep the pathways clear, the machine will likely outlive the person using it.

Key Things to Know

One thing I’ve learned after years of looking into people’s kitchens is that most people treat their extractor hood like a “set and forget” appliance. They don’t. If you aren’t cleaning grease filters at least once a month, you aren’t just dealing with a smelly kitchen; you’re forcing the machine to work twice as hard as it was designed to. That thick, sticky layer of yellow sludge doesn’t just sit there—it travels. It gets into the blades and the housing, and before you know it, your extractor hood suction power has dropped to nothing, leaving you to cook in a cloud of your own steam.

You also need to keep an eye on those little charcoal filters if you have a recirculating model. They aren’t permanent. I’ve seen plenty of people trying to wash them like they’re metal mesh, but once they’re saturated, they’re dead weight. If the air coming out of the top smells like last night’s curry, it’s time for replacing charcoal filters. It’s a simple fix, but ignoring it is a quick way to turn a decent machine into a very expensive, very loud paperweight.

Five things I’ve learned from too many greasy motors

• Don’t just soak the metal filters and call it a day. If you’ve got a charcoal filter in there for recirculating, those things are useless once they’re saturated. You can’t wash them; you have to swap them out, or you’re just moving old smell around your kitchen.
• Watch your fingers when you’re prying the grease filters out. Most of them use those little spring clips that have a habit of snapping if you force them, and once they’re gone, the filter rattles every time you turn the fan on.
• Keep an eye on the light sockets while you’ve got the unit open. It’s a common mistake to leave a bit of grease film on the bulb or the socket itself, which can cause heat buildup or a nasty short. Wipe it down with a bit of rubbing alcohol while you’re in there.
• If the motor sounds like it’s struggling or whining more than usual, it’s likely not the motor itself, but the sheer weight of the grease buildup on the fan blades. A quick clean of those blades can save you from buying a whole new motor assembly.
• Check the ducting if you have an extraction model. I’ve seen plenty of people clean the hood perfectly, only to find the actual pipework is half-clogged with sludge. If the air can’t get out, the machine is working twice as hard for half the result.

The Bottom Line

Don’t wait for the motor to start whining; most “broken” hoods are just choking on grease that could’ve been washed away months ago.

A clean filter isn’t just about smell—it’s about making sure your motor isn’t working twice as hard to pull air through a wall of sludge.

Keep a proper degreaser on hand and actually use it; a quick rinse with plain water won’t cut through the heavy stuff that eventually gums up the works.

Don't Let It Go to Waste

At the end of the day, servicing your extractor hood isn’t some complex engineering feat; it’s just about being a bit more attentive than the average person. If you’ve cleared the grease from the filters, checked the ducting for any heavy buildup, and made sure the motor isn’t struggling against a layer of grime, you’ve done more than most. Most of the machines I see sitting on the kerbside in Bristol didn’t die because of a mechanical fault; they died because someone let the grease get so thick it became a fire hazard or choked the motor to death. Keep those filters clean and keep an eye on the suction, and you’ll find that a little bit of regular effort goes a long way in preventing an expensive replacement.

I know it feels like just another chore on a never-ending list, but there is a real satisfaction in knowing your kit is actually working the way it was designed to. There is a certain peace of mind that comes from hearing a motor run smoothly because you didn’t let it struggle through a cloud of fat and steam. We live in a world that wants you to just bin it and buy a shiny new model the moment something feels a bit sluggish. Don’t fall for that. Take care of your tools, and they’ll take care of you. It’s much more rewarding to maintain what you own than to constantly replace it.

Frequently Asked Questions

Is it actually worth cleaning the grease out of the motor housing, or am I just risking breaking something else?

Look, I’ve seen enough motors seized up because of grease buildup to tell you it’s worth it. If that sticky residue gets into the bearings or onto the windings, you aren’t just looking at a cleaning job; you’re looking at a replacement. Just don’t go dousing the whole thing in water. Use a damp cloth and a bit of degreaser on the housing, and keep the liquid away from the electrical connections. Be careful, but don’t be lazy.

How often do I really need to swap out the charcoal filters if I'm not using the recirculating mode?

If you aren’t using the recirculating mode, you don’t need to worry about charcoal filters at all. Those little carbon pellets are only there to scrub the smell out of the air before it gets puffed back into your kitchen. If your hood vents straight outside through a duct, the smell goes out the window with the steam. Save your money and skip the swap; you’re just buying something you don’t need.

Can I use a standard dishwasher for the metal grease filters, or will the heat warp them?

You can pop them in the dishwasher, but don’t just throw them in with the plates and call it a day. Most metal filters are fine with the heat, but if you’ve got a cheap one, the frame might warp slightly over time. My advice? Use a heavy-duty cycle and skip the rinse aid—it leaves a film that makes grease stick even faster. If they’re caked in old fat, soak them in hot soapy water first.

About Marguerite Oyelaran

I have opened more machines than most people will own. Almost none of them were broken.