Mira M status codewhat it means
Flashing white. Not a breakdown — the shower was switched off at the cord before it finished its shutdown, and it will not restart properly until it settles.
Before you start
What M means
Code M is the most interesting entry in Mira’s table because it is a fault code for something the user did, and Mira know it well enough to build a warning about it into the installation. The Advance does not stop the instant you press the button. It runs a phased shutdown, flushing the heater with cool water and bringing itself down in a controlled way, and the lights pulse while that is happening. Cut the power at the pull cord during that window and the appliance is interrupted mid-sequence, which is what M reports.
Their commissioning instructions tell the installer, in capitals, not to isolate at the pull cord until the water flow stops and the lights stop pulsing, and then to advise the user of the same thing — because isolating early "may damage the shower and will not start up correctly for the next use resulting in fault code M". The immediate remedy is simply to wait: Mira say fifteen seconds, until the lights stop flashing, before trying to start it again.
The reason this is rated as information rather than as a fault is that nothing has broken and nothing needs replacing. The reason it is here at all is that the behaviour causing it is close to universal. Almost everybody pulls the cord as they step out of the shower, because that is what you are told to do with an electric shower and it is correct on nearly every other model. On this one it interrupts something, and Mira’s own warning is that doing it repeatedly may damage the appliance rather than merely annoy it.
What causes it
| Cause | What is actually happening | How likely |
|---|---|---|
| Power pulled during the phased shutdown | The documented cause. The cord goes as you step out, the shutdown sequence is still running, and the appliance records an incorrect shutdown. | Common |
| Habit carried over from another shower | Isolating immediately is right on most electric showers and wrong on this one, so people who have swapped brands hit it repeatedly. | Common |
| Supply interruption during shutdown | A power cut or a breaker operating at the wrong moment produces the same interrupted sequence without anyone touching the cord. | Occasional |
What to try yourself
Wait fifteen seconds and let the lights stop flashing before you try to start the shower again. Mira give fifteen seconds specifically.
Start it normally. If it runs, nothing is wrong with the appliance and the code has done its job.
From now on, press Start/Stop and wait. The water will stop and the lights will stop pulsing, and only then is it right to pull the cord.
Tell everyone else in the house. This is a habit rather than a fault, so it will keep recurring until the person causing it knows about it.
Get a qualified electrician to look at your Mira M
We do not pass enquiries to a repair firm, so there is no form here. When you book a qualified electrician, 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
1 minutes
Nothing. This is a sequencing message rather than a fault, and the fix is a change of habit rather than a part.
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 Mira fault codes
- AGet it checkedFlashing red on the Status light. Mira group three water-supply problems under this one code: no supply, low pressure, or a blockage somewhere in the outlet.Related: same brand
- DGet it checkedFlashing red and yellow. The outlet thermistor has seen a temperature above what Mira allow, and the shower has stopped rather than deliver it.Related: same brand
- LGet it checkedStatus light off entirely, with Start/Stop off. Mira call this an electrical fault and the action is to check power to the shower.Related: same brand
- FGet it checkedFlashing red and blue with Start/Stop flashing. The cold water arriving at the shower is already hotter than Mira allow it to be.Related: same brand
- IGet it checkedFlashing red and white with Start/Stop flashing. Mira call it a software error, and their published remedy is simply to power cycle the unit.Related: same brand
- CGet it checkedFlashing red and yellow with Start/Stop off. A thermistor fault: the shower has lost the temperature sensing it relies on to stay safe.Related: same brand
Own a Mira electric shower? Save it and its codes come first next time.
Related guides
Common questions about Mira M
Have I damaged the shower by pulling the cord too early?
Once, almost certainly not. Mira’s wording is that isolating before the flow has stopped "may damage the shower", and it is the repetition rather than a single occurrence that is worth avoiding.
Should I stop switching the shower off at the pull cord?
No. Isolating an electric shower when it is not in use is sound practice and manufacturers recommend it. The point is only about timing — press the button, let the shutdown finish, then pull the cord.
How long does the shutdown actually take?
Mira tell you to wait fifteen seconds after the lights start flashing before attempting a restart, and the shutdown itself ends when the water stops and the lights stop pulsing. Watch the lights rather than the clock.
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.