Dual-basket air fryer
Ninja Foodi MAX Dual Zone AF400UK
Model AF400UK (also AF400) — United Kingdom
A 9.5-litre two-drawer air fryer, 2470W, with six functions including a fixed 240°C Max Crisp. Specifications read from the manual.
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Where to get real advice for this machine
Almost everything that changes a cooking answer is a property of the architecture rather than the badge. This is a dual-basket air fryer, and the Dual-basket air fryer page carries the cooking guidance that actually applies to it.
Each drawer behaves as a single basket machine, so times and temperatures transfer across unchanged. What changes is the planning: two foods with different times must be started at different moments, and the synchronise function most of these machines offer does that by delaying the shorter cook rather than by speeding it up. Total capacity is genuinely double, but each individual drawer is often slightly smaller than a comparable single-basket machine.
Does it genuinely air-fry?
Genuine air frying
Assessed against the criteria, with the manual confirming the construction. Two self-contained drawers each with a separate heating element and fan directly above a perforated crisper plate that elevates food so air passes underneath — the manual states both the separate elements and the purpose of the plate. Fast air and air reaching every surface are therefore met by construction rather than by assumption.
- Air moves fast, not just around
- Air reaches every surface of the food
- Recovers temperature quickly after loading
- Fat and moisture drain away
- Reaches genuine browning temperatures
What we know about this machine
Read from Ninja Foodi MAX Dual Zone Air Fryer AF400UK — Instructions (PDF) (revision AF400UK_IB_MP_210429_Mv3), retrieved on 2026-08-13.
It is rated at 2470 W, which is toward the top of the domestic range and means it recovers temperature quickly after cold food goes in. It has 2 independent drawers, so two foods can cook at different temperatures at once — which buys variety rather than volume. On preheating: comes up to temperature quickly. It is sold as 9.5 litres, which measures the whole drawer including the space above the food that you must not fill.
The figures above are the manufacturer’s. What they mean for cooking is AirfryerHQ’s reading of them, not a measurement — nobody here has run this machine.
Size and capacity
- Advertised capacity
- 9.5 litresA volume, not a cooking area.
- On the worktop
- 421.9 × 517.9 × 419.1 mmBefore clearance. It needs space above and behind as well.
- Weight
- 11.5 kg
Power and heat
- Power
- 2470 W
Setup and cleaning
- Cooking zones
- 2
- Preheating
- Comes up to temperature quickly
- Dishwasher safe
- Non-stick drawers, Non-stick crisper platesEverything else is a hand-wash, and the main unit never goes in.
- Supplied with
- 2 x non-stick drawers, 2 x non-stick crisper plates
In the manual’s own words: The manual answers the question directly in its troubleshooting guide: the unit does not need to be pre-heated.
Retrieved from Argos's manual library, which mirrors the manufacturer's booklet for Argos product 952/3997. Not retrieved from ninjakitchen.co.uk, whose support portal redirected to an authentication gate.
6 figures we could not establish
Each of these says WHY it is missing. “Not recorded by the sources consulted” means the manufacturer does not publish it in the document we read — not that nobody looked, and not that the figure does not exist.
- Usable cooking area
- Not recorded by the sources consulted — Not published by the manufacturer, and not derivable from litres. Establishing it requires measuring the crisper plate.
- Chamber
- Not recorded by the sources consulted — Drawer dimensions are not published. The manufacturer states a capacity in litres and a claim about how much food fits, neither of which is a dimension.
- Power range as published
- Not applicable — The manufacturer publishes a single rated figure rather than a range.
- Temperature range
- Not recorded by the sources consulted — The manual gives a preset temperature for each function and the settable span for none of them. The lowest and highest presets are 60°C and 240°C, but a preset is not a range and the two must not be conflated.
- Adjusts in
- Not recorded by the sources consulted — The manual describes TEMP arrows without stating the step. Time increments are given precisely; temperature increments are not.
- Standby power
- Not recorded by the sources consulted — Not published by this manufacturer. Only one model in this catalogue publishes a standby figure at all.
What each setting actually does
Read from the manual. The marketing name is what is printed on the panel; the canonical capability is what the mode is in generic terms, so a reader can find advice written for somebody else’s appliance.
| On the panel | Canonically | Starts at | Settable range | Preheat |
|---|---|---|---|---|
| Max Crisp | Maximum crisp | 240°C | Fixed — cannot be changed | Not stated |
| Air Fry | Air fry | 200°C | Adjustable, range not published | Not stated |
| Roast | Roast | 190°C | Adjustable, range not published | Not stated |
| Reheat | Reheat | 170°C | Adjustable, range not published | Not stated |
| Dehydrate | Dehydrate | 60°C | Adjustable, range not published | Not stated |
| Bake | Bake | 160°C | Adjustable, range not published | Not stated |
- Max Crisp: The manual states there is no temperature adjustment available or necessary. A fixed set point, and the highest of any model in this catalogue.
Error codes and display states
Only what this manufacturer publishes, and only for this manufacturer. A code means whatever the firmware author decided it means, and reading one across from another brand is the commonest way to misdiagnose a fault.
Published without a stated cause
E- What the manual says it means
- The manual states only that an E on the display means the unit is not functioning properly. No breakdown by code is published — the same single-letter position this manufacturer takes on its other appliance in this catalogue.
- What to do
- Contact the manufacturer's customer service. No user action is offered and AirfryerHQ has no further detail.
- Can it be reset?
- The manual does not say
- Does it need service?
- Yes, the manual says so
Stop using it and contact the manufacturer
Ninja Foodi MAX Dual Zone Air Fryer AF400UK — Instructions
A prompt, not a fault
Food did not cook fully
- What the manual says it means
- The manual attributes this to the drawer not being fully inserted, or to ingredients overlapping rather than being arranged in an even layer.
- What to do
- Check the drawer is fully home, arrange the food in a single layer with no overlap, and shake part-way through. Both temperature and time can be adjusted during cooking on this model.
- Can it be reset?
- Yes, the manual says so
- Does it need service?
- No, the manual says not to
Something you can correct
Ninja Foodi MAX Dual Zone Air Fryer AF400UK — Instructions
A prompt, not a fault
Lightweight food blows around the drawer
- What the manual says it means
- The manual acknowledges that the fan will occasionally lift light items, and the example it gives is the top slice of bread on a sandwich.
- What to do
- Secure the food with wooden cocktail sticks.
- Can it be reset?
- The manual does not say
- Does it need service?
- No, the manual says not to
Something you can correct
Ninja Foodi MAX Dual Zone Air Fryer AF400UK — Instructions
Cleaning this model
The parts this architecture has, what collects on each, and what its own manual permits. Full methods and prohibitions are on the cleaning pages.
| Part | What is on it | How often | Dishwasher |
|---|---|---|---|
| Basket | Ordinary residue after cooking | After every use | Dishwasher safe on the models we hold |
| Basket | Burnt-on residue | When it needs it | Depends on your model — check the manual |
| Basket | Ordinary residue after cooking | After every use | Depends on your model — check the manual |
| Basket | Stuck food | When it needs it | Depends on your model — check the manual |
| Crisper plate | Looking after the coating | When it needs it | Depends on your model — check the manual |
| Drawer | Greasy film | After every use | Dishwasher safe on the models we hold |
| Interior of the chamber | Greasy film | After every use | Not removable, so the question does not arise |
| Interior of the chamber | Greasy film | About weekly | Not removable, so the question does not arise |
| Interior of the chamber | Lingering smell | When it needs it | Not removable, so the question does not arise |
| Heating element area | Carbonised deposit | About monthly | Not removable, so the question does not arise |
| Fan and air intake | Greasy film | About monthly | Not removable, so the question does not arise |
| Exterior and body | Greasy film | About weekly | Not removable, so the question does not arise |
| Controls and display | Greasy film | About weekly | Not removable, so the question does not arise |
The drawers and crisper plates are the only dishwasher-safe parts, and the manufacturer recommends hand-washing them anyway to extend their life. The main unit must never be immersed or put in a dishwasher.
Faults the manual documents, as printed
Only what the manufacturer publishes. AirfryerHQ does not invent the meaning of an error code, and where a manual documents one undifferentiated fault state that is what appears here.
“E”
The manual states only that an 'E' on the display means the unit is not functioning properly. No breakdown by code is published.
The manual instructs the owner to contact the manufacturer's customer service. AirfryerHQ has no further detail and will not invent any.
Food did not cook fully
The manual attributes this to the drawer not being fully inserted, or to ingredients overlapping rather than being in an even layer.
Check the drawer is fully home, arrange food in a single layer with no overlap, and shake part-way through. Temperature and time can both be adjusted during cooking.
Lightweight food blows around the drawer
The manual acknowledges that the fan will occasionally lift light items — the example it gives is the top slice of bread on a sandwich.
Secure the food with wooden cocktail sticks.
Replaceable parts
Read from this machine’s own documentation. Fit is stated only for the models a manufacturer names — it is never inferred from advertised capacity.
Crisper plate
Crisper plate for the Ninja AF400UK
The raised perforated plate that sits in the bottom of each basket. It lifts the food clear of the drawer floor so air reaches the underside and fat drains away — which is the difference between air frying and shallow roasting in a hot box. The machine takes two.
You can fit this yourself: It lifts straight out and drops straight back in. Order by the reference above from the manufacturer's own parts store. The manufacturer describes it as the crisper plate for the AF400 Series; it is not the AF300UK part.
Manufacturer reference:
4411CY400EUUKPeople replace it because: the non-stick coating has worn or is peeling; it is lost, or was missing from the box; it is cracked, warped or broken.
A crisper plate whose coating is flaking should be taken out of service. Metal utensils and abrasive cleaners are what wear it, and the manual prohibits both on the coated parts.
Check the model identifier on the rating label before ordering. The AF300UK uses a different plate with a different reference.
Ninja air fryer replacement parts
Drawer
Left drawer for the Ninja AF400UK
The left-hand outer drawer. It holds the basket and catches the fat that drains through the crisper plate, so it takes the most grease and the most washing. The left and right drawers are not the same part.
You can fit this yourself: Drawers slide out and back in as part of normal use, so fitting a replacement is not a repair. Order the LEFT drawer by its own reference — the right-hand drawer is a different part with a different code.
Manufacturer reference:
4412CY400EUUKPeople replace it because: the non-stick coating has worn or is peeling; it is cracked, warped or broken; it cannot be got clean any more.
A drawer that no longer closes squarely, or whose coating has begun to flake, should be replaced rather than persevered with. The manual states the drawers and crisper plates are the only dishwasher-safe parts and recommends hand-washing them anyway to extend their life.
The model identifier is on the rating label on the underside or rear of the appliance. AF300UK and AF400UK parts are not interchangeable.
Ninja air fryer replacement parts
Drawer
Right drawer for the Ninja AF400UK
The right-hand outer drawer, which is a different part from the left one despite looking symmetrical.
You can fit this yourself: Order the RIGHT drawer by its own reference. Asking the manufacturer for 'a drawer' without saying which side is the commonest way to receive the wrong one.
Manufacturer reference:
4413CY400EUUKPeople replace it because: the non-stick coating has worn or is peeling; it is cracked, warped or broken; it cannot be got clean any more.
As with the left drawer: flaking coating or a drawer that no longer seats squarely is a reason to replace it rather than continue.
Check the rating label for the model identifier, and check which side you need before ordering.
Ninja air fryer replacement parts
Recall and safety status
Recall status not checked
No verified recall or safety notice is currently recorded in AirfryerHQ for this appliance. That is a statement about this catalogue and not about the product: AirfryerHQ holds a small number of checked alerts and is not a copy of the UK register. Check the authority's own register before concluding that an appliance is unaffected.
The Office for Product Safety and Standards publishes the UK register of product safety alerts, reports and recalls on GOV.UK, and Electrical Safety First operates a recall checker for electrical appliances. Registering an appliance with its manufacturer is what makes a direct notification possible.
AirfryerHQ has no recall data feed and has not checked. That is not a clean bill of health — it is an absence of checking, and it is recorded as one. Check the manufacturer’s own recall page and your national product-safety register.
Finding the manual
The instruction booklet identifies its own revision as AF400UK_IB_MP_210429_Mv3. It contains no cooking chart; the manual refers the reader to a separately supplied Quick Start Guide for charts, which AirfryerHQ has not obtained.
About this model
The dual-basket machine most UK readers mean when they say 'the Ninja one'. Two independent drawers, each with its own element and fan, and Sync and Match functions for getting two foods to finish together. Everything below was read from the manufacturer's instruction booklet and its own product specification page.
Owning this machine
The questions that come after the cooking.
- Looking after itFive minutes a week and one check a month, nearly all of it about grease.
- What to clean it withIncluding which tool every manufacturer in this catalogue prohibits.
- The coating, and when a basket is finishedThe part that decides how long this appliance lasts.
- Replacing a part, and what to ask forWhere the model and serial numbers are, and why no order code appears here.
- Accessories, and whether you need themWith the verdicts first and no affiliate links anywhere.
- Repair, replace, or stop using itThe symptoms that mean stop now, and the ones that mean a part.