Built-in oven with an air-fry mode
Bosch built-in oven HBG934B.1 with Air Fry
Model HBG934B.1 — United Kingdom, European Union
A built-in oven where Air Fry is a named heating function spanning 30–300°C, with its own accessory and its own rules — including do not preheat and do not use greaseproof paper.
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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 built-in oven with an air-fry mode, and the Built-in oven with an air-fry mode page carries the cooking guidance that actually applies to it.
Treat published air-fryer times as a lower bound and expect to add 25–40%, or to use a higher temperature. The cavity is many times larger than a drawer, so air velocity at the food is far lower and thermal recovery after the door opens is slow. A perforated air-fry tray, if one was supplied, makes a real difference and a solid baking tray defeats the mode entirely. Most importantly: a full oven cavity does not concentrate airflow the way a small chamber does, so this mode narrows the gap to a fan oven rather than closing it.
That is guidance for the type. On preheating, this machine’s own manual is quoted further down this page, and where the two differ the manual is the one to follow.
Does it genuinely air-fry?
Partly — see the assessment
Assessed as partial, and the reasoning is the cavity rather than the function. Air Fry here is unambiguously a real, separately engineered mode: dedicated perforated accessory, single-level-only operation, explicit no-preheat instruction, and a prohibition on greaseproof paper on the stated grounds that air must circulate. Air reaching all surfaces and browning temperatures are met. What cannot be established from the manual is air VELOCITY at the food in a full-size cavity, and rapid thermal recovery is not met by an oven of this size. Without the velocity criterion the verdict cannot be `genuine`, and a reader should expect results between a fan oven and a drawer machine rather than equal to a drawer machine.
- Air reaches every surface of the food
- Reaches genuine browning temperatures
What we know about this machine
Read from Bosch built-in oven HBG934B.1 — Instruction manual (PDF) (revision 9001885350_A), retrieved on 2026-08-13.
It has a single cooking cavity, so everything in it cooks at one temperature for one time. It runs from 30°C to 300°C, and the low end is genuinely useful: it is enough to dehydrate, prove dough or hold food warm.
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.
Power and heat
- Temperature range
- 30–300°C
Setup and cleaning
- Cooking zones
- 1
- Dishwasher safe
- Enamelled accessoriesEverything else is a hand-wash, and the main unit never goes in.
- Supplied with
- Air Fry tray (optional accessory on some models), Universal pan, Wire rack
In the manual’s own words: For Air Fry specifically, the manual instructs: do not preheat the oven. That is notable because a full-size cavity is the architecture where preheating would most be expected to matter, and it is the fifth manufacturer no-preheat position in this catalogue.
10 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.
- Advertised capacity
- Not recorded by the sources consulted — Not stated in the instruction manual read.
- Usable cooking area
- Not recorded by the sources consulted — Not published.
- Chamber
- Not recorded by the sources consulted — The manual publishes installation and niche dimensions rather than cavity dimensions.
- On the worktop
- Not recorded by the sources consulted — Installation dimensions are published rather than appliance dimensions.
- Weight
- Not recorded by the sources consulted — Not published.
- Power
- Not recorded by the sources consulted — Not stated in the instruction manual read.
- Power range as published
- Not recorded by the sources consulted — Not stated in the copy read.
- Adjusts in
- Not recorded by the sources consulted — Not stated.
- Standby power
- Not recorded by the sources consulted — Not published by this manufacturer. Very few models in this catalogue publish a standby figure at all.
- Preheating
- Not recorded by the sources consulted — The manual does not say how quickly the oven reaches temperature. What it says about preheating for Air Fry is given below.
What each setting actually does
Read from the manual. The first column is the name printed on the panel; the second is what that setting is in plain terms, so you can use advice written for somebody else’s appliance.
| On the panel | In plain terms | Starts at | Settable range | Preheat |
|---|---|---|---|---|
| Air Fry | Air fry | Not printed in the manual | 30–300°C | No |
| Circulated air grilling | Grill | Not printed in the manual | 30–300°C | Not stated |
| Gentle hot air | Bake | Not printed in the manual | 125–250°C | No |
- Air Fry: The manual publishes 30–300°C for this function, and says not to preheat for it.
- Circulated air grilling: For roasting poultry, whole fish or larger pieces of meat; the grill element and fan alternate.
- Gentle hot air: The mode used to determine the appliance’s energy efficiency class.
Questions owners ask about this machine
Answered from this model’s own manual (Bosch built-in oven HBG934B.1 — Instruction manual) and nothing else. Where the manual does not address a question, it is not answered here from another machine’s.
What this manual calls the parts
- Air fry tray
- The perforated plate the food sits on.An optional accessory on some versions. It goes at shelf position 3.
- Wire rack
- A mesh rack or shelf in an oven-style machine.Goes in with the open side towards the door and the curved lip facing down.
- Universal pan
- The tray underneath that catches fat.Also a baking pan in its own right. Empty at level 1, it catches what falls from the Air Fry tray.
Other manufacturers use different words for the same parts, and sometimes the same word for a different one. What each part is called, brand by brand.
- Before the first cookWhat do I do before cooking in it for the first time?
- Three things, in order. Work through the start-up settings on the display, then open and close the door once. Take everything out of the cooking compartment, including leftover packaging and adhesive tape, and wipe the smooth surfaces with a soft, damp cloth. Then heat it empty: 3D hot air at the maximum temperature for one hour, with the kitchen ventilated.In the manual: Before using for the first time.
- The parts, and how they go inWhich way round do the wire rack and the trays go in?
- The manual is specific. Turn any accessory so the notch is at the rear and facing downwards. The wire rack goes in with its open side towards the door and its curved lip facing down. A baking tray or the universal pan slides in with the sloping edge towards the door. Put in that way round, an accessory can be pulled out about halfway without tipping. To catch drips, the wire rack sits on the universal pan with both spacers on the pan's rear edge.In the manual: Accessories: Locking function; Sliding accessories into the cooking compartment.
- The parts, and how they go inHow do I set the oven up for Air Fry?
- On one level only, at shelf position 3, without preheating. Food goes on the Air Fry tray, which Bosch sells as an optional accessory where it is not supplied, or on the universal pan. With the Air Fry tray, an empty universal pan can go in at level 1 to catch dirt. The manual says not to use greaseproof paper, because the air must circulate, and not to defrost frozen food first.In the manual: How it works: Air Fry, cooking tips.
- Opening it while it cooksWhat happens if I open the door while it is cooking?
- The operation stops, and resumes automatically when the door is closed. To pause without opening it, press the start/pause control and press it again to carry on. The cooling fan keeps running for a while after cooking has ended, which is normal, and the ventilation slots above the door must not be covered.In the manual: Appliance door; Interrupting the operation; Cooling fan.
- Settings the panel does not explainWhat does an error code such as E0111 on the display mean?
- That the electronics have detected a fault. The manual gives E0111 as an example of an error code made up of letters and numbers and does not list what each one means. Switch the appliance off and on again: if the fault was a one-off, the message goes. If it comes back, the manual says to call the after-sales service and quote the exact message.In the manual: Troubleshooting: Malfunctions.
- How much goes in at onceHow much food can go on for Air Fry?
- The manual gives no weight. Its rule is to cover the Air Fry tray or universal pan evenly and, if possible, in a single layer, and to turn the food halfway through, or twice for larger quantities. Only one level can be used with this type of heating.In the manual: How it works: Air Fry, cooking tips.
- The non-stick coatingWhat are the surfaces inside made of, and what damages them?
- This manual does name materials. The back panel of the cooking compartment is self-cleaning and is described as coated with a porous, matt ceramic layer; the compartment itself is enamelled. The manual says nothing is to be placed on the compartment floor above 50°C, not accessories, greaseproof paper or foil, because heat builds up and damages the enamel, and that water on the floor above 120°C does the same. It does not describe a non-stick coating on the accessories.In the manual: Preventing material damage; Self-cleaning surfaces.What wears a coating, and when a part is finished
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
E0111- What the manual says it means
- The manual gives E0111 as an example of an error code made up of letters and numbers and says only that the electronics have detected a fault. It does not list what any individual code means.
- What to do
- Switch the appliance off and on again. If the fault was a one-off, the message disappears. If it appears again, the manual says to call the after-sales service and to quote the exact error message.
- Can it be reset?
- Yes, the manual says so
- Does it need service?
- The manual does not say
Stop using it and contact the manufacturer
Bosch built-in oven HBG934B.1 — Instruction manual
Cleaning this model
The parts this machine has, what collects on each and how often it needs doing. Full methods and prohibitions are on the cleaning pages.
Which parts go in the dishwasher
Stated as dishwasher safe for this model: Enamelled accessories. Anything not listed is washed by hand, and the main unit never goes in.
The cleaning table says enamelled accessories are dishwasher safe, and that the meat probe and the pull-out rails are not to be cleaned in a dishwasher. It does not say whether the optional Air Fry tray is enamelled.
Source: Bosch built-in oven HBG934B.1 — Instruction manual.
| Part | What is on it | How often |
|---|---|---|
| Wire rack, air fry tray, universal pan | Burnt-on residue | After every use |
| Inside the oven | Greasy film | After every use |
| Inside the oven | Lingering smell | When it needs it |
| Heating element area | Carbonised deposit | About monthly |
| Vents and air intake | Greasy film | About monthly |
| Door glass | Greasy film | About weekly |
| Exterior and body | Greasy film | About weekly |
| Controls and display | Greasy film | About weekly |
The manual instructs inserting an empty universal pan at level 1 beneath the Air Fry accessory at level 3, to catch dripping fat and protect the cavity floor.
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.
The appliance is not working
Three causes are printed: the circuit breaker in the fuse box has tripped, there has been a power cut, or there is an electronics fault.
Check the circuit breaker and whether other appliances have power. For an electronics fault, the manual says to disconnect the appliance at the fuse for at least 30 seconds and then reset the basic settings to the factory settings.
The appliance does not heat up
Demo mode is switched on, or there has been a power cut.
Switch the circuit breaker off and on again and turn demo mode off in the basic settings within about five minutes. After a power cut, open and close the appliance door once; the manual says the appliance is then checked and ready to use.
Maximum operating time reached
Not a fault. To prevent unwanted permanent operation, the appliance stops heating after several hours if the settings are unchanged, and a message appears in the display.
Switch the appliance off and on again, then reset and start the operation. The manual's tip is to set a cooking time so that it does not switch off when you do not want it to.
“E0111”
The manual gives E0111 as an example of an error code made up of letters and numbers: the electronics have detected a fault. It does not list what each code means.
Switch the appliance off and on again. If the fault was a one-off the message disappears; if it appears again, the manual says to call the after-sales service and quote the exact message.
Replaceable parts
AirfryerHQ holds no replacement-part details for Bosch built-in oven HBG934B.1 with Air Fry. That is a statement about this catalogue rather than about the appliance: its removable parts can wear or be lost like any other machine’s, and the manual read for this model does not list them with references we could record. What can be replaced, and what to ask for covers the general case, including where to find the model number a parts desk will ask you for.
Accessories with something documented for this model
Statements read from this machine’s own documentation. AirfryerHQ does not infer that an accessory fits an appliance from its advertised capacity, and no manufacturer here publishes the dimensions that would let anybody do so.
Useful for a specific job
Multi-level rack
It adds a level. It does not double capacity: the one manufacturer that publishes loads for its own two-level rack gives less food across two levels than across one.
You probably do not need this
Disposable paper liners
Sold to save washing up, and the one comparison we have read found they do not: grease goes through. Several manufacturers forbid paper in the basket altogether.
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 document read for this page is Bosch built-in oven HBG934B.1 — Instruction manual (PDF), retrieved on 2026-08-13. A different revision, or a booklet for another market, may not match it.
The Air Fry settings table gives no quantities on any row, which matters more here than elsewhere: a full-size cavity is where load size affects the result most, and this is the only oven chart in the catalogue.
About this model
The model that proves the product’s scope argument. Air Fry sits in this oven’s heating-type table alongside Gentle hot air and Circulated air grilling as a function in its own right, with a published temperature span, a dedicated Air-Fry accessory, a settings table and six operating rules. Several of those rules contradict what air-fryer content generally assumes, which is precisely why an oven belongs in this catalogue rather than outside it.
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.