TL;DR
- White smoke is usually grease burning off the heating element. Clean the element, not the basket.
- Blue or grey smoke with a burning smell means fat pooling in the drawer. Add a splash of water underneath.
- First few uses: light smoke and a chemical smell are the factory coating burning off. Normal, and it stops.
- Black smoke or an electrical smell: unplug it now. That one is not a cooking problem.
- Fatty food is the usual trigger. Bacon, sausages, burgers and wings all drip.
Table of Contents
Smoke from an air fryer is nearly always fat meeting something hotter than fat should meet. Working out which fat, and where, tells you the fix in about a minute.
Identify it by colour
| What you see | Cause | Fix | Urgent |
|---|---|---|---|
| Thin white smoke, smells of old food | Grease on the heating element | Unplug, cool, wipe the element | No |
| Blue or grey smoke while cooking fatty food | Fat pooling in the bottom of the drawer | Add 2 tbsp water under the basket | No |
| Light smoke, chemical smell, brand new machine | Factory coating burning off | Run empty at 200C for 10 min | No |
| Smoke from oil, no fatty food | Wrong oil, past its smoke point | Switch to a high smoke point oil | No |
| Smoke plus burning paper smell | Liner lifted into the element | Stop, unplug, remove it | Yes |
| Black smoke, acrid or electrical smell | Wiring or element fault | Unplug at the wall. Do not use it again | Yes |
Stop and unplug if you smell burning plastic or electrics, or see black smoke. Everything else on this page is a cooking problem you can fix. That one is a fault, and it needs the manufacturer rather than a cleaning cloth.
Cause 1: grease on the element
The most common cause by a distance. An air fryer fan atomises fat and sprays it upward, so the heating element above your food collects a film of grease that never gets washed during a normal clean. Next time the element glows, that film burns.
Unplug the machine, let it cool, then turn it upside down so you can see the element. Wipe it with a damp cloth. For carbonised deposits use a paste of bicarbonate of soda and water on a soft cloth, then let it dry fully before plugging in.
Do it every fifth use and the problem never starts. Our air fryer cleaning guide has the full routine.
Cause 2: fat pooling in the drawer
Cooking bacon, burgers or wings renders a lot of fat. That fat drips through the crisper plate and collects in the drawer, where the airflow keeps it hot enough to smoke.
Pour two tablespoons of water into the drawer, underneath the crisper plate. The water keeps the pooled fat below its smoke point without touching your food or affecting the crisp. Nothing else changes. It is the single most useful trick in air frying.
For very fatty food, pause halfway and pour the fat off as well.
Cause 3: the wrong oil
Every oil has a smoke point, and an air fryer at 200C will exceed several of them. Olive oil is the usual culprit, since extra virgin starts smoking around 190C.
| Oil | Smoke point | Air fryer safe |
|---|---|---|
| Extra virgin olive | ~190C / 375F | Marginal, smokes at 200C |
| Butter | ~150C / 300F | No, burns |
| Light olive oil | ~240C / 465F | Yes |
| Rapeseed / canola | ~230C / 445F | Yes |
| Sunflower | ~230C / 445F | Yes |
| Groundnut / peanut | ~230C / 445F | Yes |
| Avocado | ~270C / 520F | Yes, the safest |
Using too much oil causes smoke on its own, whatever the type. Half a teaspoon per portion is plenty, and the excess just pools in the drawer.
Cause 4: a brand new machine
Light smoke and a sharp chemical smell on the first two or three uses is manufacturing residue burning off, not a fault. Run the machine empty at 200C for ten minutes with a window open and it clears. Our air fryer plastic smell guide covers the smell side in detail.
Cause 5: loose liners and stray food
A paper liner with nothing on top of it will lift into the element and catch fire within seconds. Never preheat with an empty liner in the basket, and never use one larger than the basket floor.
Small bits of food left from a previous cook do the same on a smaller scale. Crumbs sitting on the element burn every time it heats. Air fryer ovens have a crumb tray for exactly this reason, and it needs emptying.
Quick diagnosis
| Question | If yes | Then |
|---|---|---|
| Is the food fatty? | Bacon, wings, burgers, sausages | Water in the drawer |
| Is the machine new? | First 3 uses | Run empty, it will stop |
| When did you last clean the element? | More than 5 uses ago | Clean it |
| Are you using olive oil or butter? | Yes | Switch oil |
| Is there a liner in there? | Yes | Check it is weighed down |
| Does it smell electrical? | Yes | Unplug and stop |
Smoke that survives all of the above, on a clean machine with lean food and no oil, suggests a thermostat running hot. That is a warranty conversation. If you are replacing the machine anyway, our best air fryers roundup is the place to start.
Frequently asked questions
Why is my air fryer smoking?
Nearly always grease burning somewhere it should not be. The most common source is a film of fat on the heating element above the food, which a normal basket clean never touches. The second is fat pooling in the bottom of the drawer while you cook something fatty. Clean the element, and put two tablespoons of water under the crisper plate.
Why does my air fryer smoke when I cook bacon?
Because bacon renders a lot of fat, and it drips through the crisper plate into the drawer where the airflow keeps it hot enough to smoke. Pour two tablespoons of water into the drawer underneath the plate. The water holds the pooled fat below its smoke point, and it does not affect how crisp the bacon gets.
Is it normal for a new air fryer to smoke?
For the first two or three uses, yes. Manufacturing oils and coating residue burn off when the machine first gets hot, giving light smoke and a chemical smell. Run it empty at 200C for ten minutes with a window open, and it should clear. Smoke that continues past the first few uses is something else.
Can I put water in my air fryer to stop smoke?
Yes, in the drawer underneath the crisper plate, never in the basket with your food. Two tablespoons is enough. The water keeps rendered fat below its smoke point and evaporates harmlessly. It will not make your food soggy, because it sits below the plate and away from the airflow that does the crisping.
What oil should I use in an air fryer?
Anything with a smoke point above 200C. Avocado, rapeseed, sunflower, groundnut and light olive oil all qualify. Extra virgin olive oil starts smoking around 190C, so it is marginal at air fryer temperatures, and butter burns well below that. Use half a teaspoon per portion, since excess oil pools in the drawer and smokes regardless of type.
My air fryer smokes even when it is clean and empty. What now?
That points at a fault rather than a cooking problem, particularly if the smell is acrid or electrical rather than food related. Unplug it at the wall and stop using it. A thermostat running above its set point, or a failing element, will do this, and both are warranty matters.
Can an air fryer catch fire?
It is rare but possible, and loose paper liners are the usual cause. An empty liner with no food weighing it down lifts straight into the element and ignites within seconds. Heavy grease build up can also flare. Never preheat with an empty liner in the basket, keep the element clean, and never leave the machine running unattended in a cupboard or under a low shelf.