Miele Keeping warmwhat it means
Not the appliance restarting on its own. Miele publish this as an automatic function with figures: 80 W for up to fifteen minutes after a 450 W programme.
Before you start
What this means
A microwave that finishes cooking, sits quietly for a couple of minutes and then starts running again is alarming, and on a Miele it is a documented feature with numbers attached. Their text: the Keeping warm function "switches on automatically at the end of a cooking programme which has been using at least 450 W, providing the door remains closed and no buttons are pressed", and "after approx. 2 minutes, the food will be kept warm using 80 W for a maximum period of 15 minutes", with "Keeping warm" appearing in the display. Opening the door or operating any button cancels it.
Miele add two things worth knowing: it cannot be selected as a function in its own right, and it can be switched off in the settings. Every condition in that paragraph is doing work. It only arms after a programme that used at least 450 W, so a gentle defrost never triggers it. It waits about two minutes, which is why the restart feels disconnected from the thing you just cooked. It needs the door to have stayed closed and nothing to have been pressed, so it only happens when you walked away. And it runs at 80 W, which is a small fraction of full power — enough to hold a temperature, not enough to continue cooking. That combination is exactly why it gets mistaken for a fault. The appliance appears to start on its own, some minutes after you thought it had finished, at a power level too low to hear much difference in.
If you have not read the manual, the reasonable conclusion is that something is wrong with the controls. It is also the reason a plate of food left in a Miele for ten minutes can be hotter than you left it rather than cooler, which is the feature working rather than anything to worry about.
What causes it
| Cause | What is actually happening | How likely |
|---|---|---|
| A programme at 450 W or above finished untouched | Miele’s exact trigger. The door stayed shut, nothing was pressed, and the function armed on its own. | Common |
| Food left in the appliance after cooking | Walking away is the condition, so the people most likely to meet this are the ones not standing there waiting. | Common |
| The setting has never been switched off | It is on by default and can be deselected in the settings menu, which most owners never look at. | Occasional |
What to try yourself
Read the display. Miele put the words Keeping warm there, so if you can see them the appliance is telling you exactly what it is doing.
Open the door, or press any button. Either cancels the function immediately, which is Miele’s published behaviour.
If you would rather it never happened, deselect the function in the settings. Miele confirm it can be switched off and that it cannot be chosen as a standalone programme.
Check the numbers against what you saw. It only follows a programme of 450 W or more, starts about two minutes afterwards, runs at 80 W and stops after fifteen minutes at the outside.
If the appliance runs at full power on its own, for longer than fifteen minutes, or without Keeping warm on the display, that is not this function and it is worth booking.
Get a qualified appliance engineer to look at your Miele microwave
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
£0
Time on site
3 minutes
Nothing. It is a published feature with a published limit, and the only cost of not recognising it is worry or an unnecessary call-out.
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 Miele fault codes
- Food in oven?Usually simple to fixA deliberate guard, not a fault. Miele will not start a programme it believes has no food in it, and they publish the exact trigger.Related: same brand
- Switches itself off during a programmeGet it checkedMiele publish a two-branch diagnosis for this. Clearing after a cooling period means airflow; doing it again after cooling means service.Related: same brand
- System lockUsually simple to fixMiele publish two separate locks with different behaviour. The system lock survives a power cut, which is why unplugging the appliance changes nothing.Related: same brand
- Demo modeUsually simple to fixThe showroom setting. Miele say the appliance does not heat up in demo mode, and Off in the Showroom programme setting, confirmed with OK held for four seconds, turns it off.Related: same brand
- Close the doorUsually simple to fixA programme has been interrupted because the door opened. Miele publish it as normal operation, and the countdown resumes rather than restarting.Related: same brand
Own a Miele microwave? Save it and its codes come first next time.
Related guides
Common questions
Is it safe to leave running?
It is a designed function with a published limit — 80 W for at most fifteen minutes — and it stops on its own. The thing to check is that the appliance genuinely stops when it says it will, and that the display says Keeping warm rather than nothing.
Why did it wait two minutes?
That is Miele’s published delay. It gives you time to take the food out, which cancels the function, so it only runs when you have actually left it. The gap is also why the restart seems unrelated to the programme that caused it.
Can I use it on purpose?
No. Miele state it cannot be selected as a separate function — it only arms automatically after a qualifying programme. What you can do is switch it off entirely in the settings.
My microwave starts by itself at full power.
That is not this. Keeping warm runs at 80 W with its own message on the display and stops within fifteen minutes. An appliance running at full power unprompted has a control fault and should be unplugged and booked in.
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 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.