Miele F12 fault codewhat it means and how to fix it
The water inlet is blocked or restricted. Miele use the same wording for F13, F15 and F173, and warn that the hose connection houses an electrical valve.
Take care
What F12 means
Miele give F12 as the water inlet being blocked or restricted, and they use exactly that phrase for three other codes too — F13, F15 and F173 all carry the identical meaning and the identical remedy. So if you have one of those, this is your page. It is a code Miele expect owners to resolve, and the checks are the usual ones: the tap, the hose, and the filter in the connection. There is one Miele-specific warning that belongs here and that people get wrong because the part does not look electrical. Miele state that the plastic housing of the water connection contains an electrical valve, and that the housing must not be dipped in water, under a heading about risk of electric shock from mains voltage. That is the chunky plastic block where the hose meets the tap. It is a mains-voltage component in a plumbing-shaped package, and it should not be submerged, cut or improvised with.
What causes it
| Cause | What is actually happening | How likely |
|---|---|---|
| Stopcock or tap not fully open | Free to eliminate, and the first thing to check if any plumbing work has happened recently. | Common |
| Inlet filter blocked | The gauze in the water connection, silted with grit from the mains. The most common genuine cause and cleanable by hand. | Common |
| Inlet hose kinked | Usually crushed when the machine was last pushed back into its housing after cleaning or repair. | Common |
| Mains pressure too low | A weak or shared supply, or a partly closed isolation valve upstream. The machine is fine; the supply is not. | Occasional |
What to try yourself
Check the stopcock or tap feeding the machine is fully open — right off and right on again rather than judging by the handle.
Pull the machine out enough to see the hose along its length and straighten any kink.
Close the tap and clean the filter in the water connection following Miele’s instructions for your model.
Miele warn of risk of electric shock here: the plastic housing of the water connection contains an electrical valve and must not be dipped in water. Clean the filter, not the housing.With the hose off, run the tap into a bucket briefly. A weak flow means the problem is your supply rather than the appliance.
Reconnect, restore the supply and run a short programme, watching the connection for weeping.
Get a qualified appliance engineer to look at your Miele F12
Vetted local appliance engineers. No obligation.
What it costs to fix
Typical repair cost
£0–£220
Time on site
30 minutes
Usually free. A replacement Miele inlet valve and hose assembly is typically £110 to £200 fitted.
Typical UK prices including parts and labour, updated August 2026. Your quote may differ.
What other owners found
Nobody has shared what worked for them on this code yet. If you have had it, you would be the first — and it genuinely helps the next person.
Related Miele fault codes
- E18Get it checkedWater is not getting in. Bosch publish a full owner procedure including a flow rate you can measure with a jug.Related: water intake
- F06Get it checkedWater fill timeout. The other code Hotpoint hand back to you, and their own checklist covers pressure as well as the tap.Related: water intake
- i10Get it checkedNo water is coming in. One beep on a model without a display, and AEG publish a pressure range you can test against.Related: water intake
- IEGet it checkedWater inlet problem. It is IE with a letter I, not 1E — the washing machine convention does not apply here.Related: water intake
- E02Get it checkedWater outage error — the machine asked for water and none came. Beko send you to the supply and the filters first.Related: water intake
- E2Get it checkedThe dishwasher does not fill with water. Some models show CHECK WATER or NO WATER in words instead of a code.Related: water intake
Common questions about Miele F12
I have F13, F15 or F173 rather than F12. Is this the right page?
Yes. Miele publish all four with the identical meaning — the water inlet is blocked or restricted — and the same remedy. Four codes, one answer.
Why can I not just rinse the whole hose connection under the tap?
Because Miele state the plastic housing contains an electrical valve and must not be dipped in water, under an electric shock warning. It looks like plumbing and it is partly electrics. Clean the filter itself and leave the housing dry.
What if everything is clear and it still shows?
Then the inlet valve or the supply is at fault rather than a blockage, and Miele’s guidance is to contact Customer Service if the fault persists. You will have eliminated the free causes, which shortens the visit.
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
Checked by Appliance technical reviewer (Qualifications to be displayed on appointment) on 5 August 2026.