Bosch Not heatingwhat to check
Bosch answer this by naming the heating element and telling you to book a repair. Their own manuals give three free causes their website leaves out entirely.
Take care
What this means
An oven that turns on and never gets hot is the most common oven complaint there is, and Bosch UK answer it in two sentences: the issue could be the heating element, inspect it for burns and damage, a working element glows bright red while a damaged one stays dark grey, and they advise against carrying out a repair yourself and recommend booking a Bosch engineer.
Two problems with that. The first is practical — most current Bosch built-in ovens are fan ovens whose main element sits behind the rear baffle plate, so it cannot be inspected without dismantling the cavity. The advice to look at it is only actionable for the grill element on the roof, and Bosch do not say which element they mean. The second is the omission.
Bosch’s own manuals file two further causes under the appliance not heating up — demo mode being active, and a power cut, after which their newest manual has you open and close the door once before the oven is ready — and the database their sibling brands publish for the same symptom adds the clock not having been set and the door not being properly closed. All of them cost nothing to check and all of them are missing from the page that recommends a paid engineer.
What causes it
| Cause | What is actually happening | How likely |
|---|---|---|
| Demo mode is active | The appliance responds to everything and heats nothing, by design. Bosch’s manuals list it first under "appliance does not heat up", and the sibling brands’ database puts it in one sentence: in demo mode the oven runs cold. | Common |
| The clock has not been set since a power cut | Bosch’s manuals say the clock flashes after a power cut and has to be set again, and the sibling brands’ database files "reset the time" under an oven that does not heat up. Setting the time of day is frequently the same action as clearing a fault on these ovens. | Common |
| The heating element has failed | The only cause Bosch’s website offers. A failed element stays dark grey where a working one glows, though on a fan oven it is hidden behind the rear panel. | Common |
| The door is not properly closed | Named in the sibling brands’ database for this symptom. The oven will not commit to heating until it is satisfied the door is shut. | Occasional |
| The circuit breaker has tripped or the supply is interrupted | Bosch manuals send you to the fuse box for an appliance that appears dead, and a partially working oven can still point at a supply problem. | Occasional |
What to try yourself
Check the display for a demo indication. Bosch’s current manuals say a symbol appears on the display when demo mode is active, and their compact ovens print the word Demo in the status bar. In demo mode the oven runs cold by design and nothing is wrong with it — the manuals’ way out is to switch the circuit breaker off and on and then turn demo mode off in the basic settings within three minutes.
Set the clock. If the time is flashing after a power cut, that alone can be why the oven refuses to heat, and it is the single cheapest thing on this list.
Check for a lock symbol, and close the door firmly enough to feel it seat on the catch rather than resting against the seal.
Run the grill on its own. If the grill glows and the fan oven stays cold, that points at the fan oven element specifically, which is useful information for whoever attends.
Do not take the rear baffle plate off to look at the element. Bosch advise against owner repair here, and the element behind that panel is live mains wiring whether the oven is on a plug or a cooker circuit.
Get a qualified appliance engineer to look at your Bosch oven
We do not pass enquiries to a repair firm, so there is no form here. When you book a qualified appliance engineer, tell them the make, the model and the exact code or message on the display, and ask whether they carry parts for this make — that is what turns one visit into a repair rather than a quote.
What it costs to fix
Typical repair cost
£100–£200
Time on site
15 minutes
Nothing at all if it turns out to be demo mode, the clock or the door. A fan oven element is typically £20 to £50 as a part, with most of the cost being the visit.
Typical UK prices including parts and labour, updated September 2026. Your quote may differ.
Own this appliance and had this code? . Nothing is published until a person has read it.
Related Bosch fault codes
- Error codeGet it checkedBosch UK publish no oven fault code list. Their Error Codes link redirects to itself, and their troubleshooting tool returns nothing while their sibling brands answer in full.Related: same brand
- LOCUsually simple to fixBosch UK say the child lock shows LOC. None of their own manuals says that — six of them describe a key symbol or SAFE, and none mentions LOC at all.Related: same brand
- E106Get it checkedBosch name this code and never say what it means. The one thing they do tell you is that the microwave still works, which on a combination oven is worth knowing.Related: same brand
Own a Bosch oven? Save it and its codes come first next time.
Related guides
Common questions
Bosch told me to inspect the heating element. Can I?
Only partly, and their page does not say which element they mean. The grill element on the cavity roof is visible and you can see whether it glows. The fan oven element is behind the rear baffle plate on most current Bosch built-in ovens and is not inspectable without dismantling the cavity, which is work their same page advises you not to do.
Why does Bosch not mention demo mode or the clock?
We do not know. Demo mode is the first cause Bosch’s own manuals give for an oven that will not heat, every one of those manuals says the clock flashes after a power cut and must be set again, and the Neff and Siemens database gives the clock, the door and an overheat cut-out for the same symptom. Bosch’s website gives one cause and a booking link. It is the same website-versus-manual divergence we have found across this group.
Only the grill works. Does that narrow it down?
Considerably. The grill and the fan oven run on separate elements, so a working grill tells you the appliance has power, the door is being read as closed, and the controls are functioning. That makes the fan oven element or its supply the likely candidate rather than anything shared between the two.
Technical review
Not reviewed by an engineer
No engineer has read this page. Severity follows what the manufacturer publishes, and we would rather tell you that than let a byline imply a sign-off.
Sources and how we verified this
We establish the facts from the sources below and then write the explanation ourselves. We do not copy manufacturer wording and we do not host their manuals.
- Manufacturer support portal
- Manufacturer technical and service documentation
This page has not been reviewed by an engineer, and we would rather tell you that than imply otherwise. The severity rating follows what the manufacturer publishes: where they say isolate the appliance and call someone, so do we.