Triton Shower fails to shut offwhat to check
Triton problem 7. Water keeps running after you press stop, and the shower is still an energised appliance while you work out what to do.
Take care
What this means
This is the one fault in the category where the appliance carries on doing something after you have told it not to, and it is worth taking seriously for that reason rather than because the failure itself is exotic. Triton publish two causes and both are single components. The first is a faulty start/stop switch: the button is no longer telling the electronics that you have pressed it, so as far as the shower is concerned it was never asked to stop. The second is debris in the solenoid — the electrically operated valve that admits water. That valve is held open while the shower runs and closes when the shower stops, and grit or scale caught on its seat can hold it off, so water continues to pass even after the coil is de-energised.
Their remedies are correspondingly direct: replace the switch, or replace the solenoid valve. What makes this worth its own page is the immediate situation rather than the eventual repair. A shower that will not stop is a shower that is potentially still heating, and the instinct is to stand there pressing the button.
The right move is to pull the cord, which removes the supply and closes the solenoid, and then close the servicing valve on the inlet if water is still passing. Those two actions make the problem static and turn an alarming situation into a booked repair. It is also worth distinguishing the two causes from outside, because you often can: if the button no longer feels like it is doing anything, that points at the switch; if the button responds and the lamp changes but water keeps running, that points at the valve.
What causes it
| Cause | What is actually happening | How likely |
|---|---|---|
| Debris holding the solenoid valve open | Grit or scale on the valve seat stopping it seating when the coil de-energises. Triton’s remedy is to replace the valve rather than clean it. | Common |
| Start/stop switch failed | The button no longer registers the press, so the shower is never asked to stop. Triton’s remedy is to replace the switch. | Common |
| Solenoid coil stuck energised | A control or wiring fault leaving the valve driven open. Presents identically from outside and is established with the cover off. | Occasional |
| Scale on the valve seat in a hard water area | The slow version of debris. Builds over years and eventually stops the valve sealing at all. | Occasional |
What to try yourself
Pull the cord or switch off at the isolator straight away. That removes the supply, de-energises the solenoid and stops the shower heating.
Do this first, before investigating anything. A shower that will not stop is one that may still be heating water, and the button you would normally press is one of the two suspects.If water is still passing with the power off, close the servicing valve on the inlet pipe to the shower. That makes the situation static until it can be repaired.
Note which of the two it looks like. A button that feels dead points at the switch; a button that responds while water keeps running points at the valve.
Leave the shower isolated and book the repair. Both of Triton’s published remedies are component replacements behind the cover.
Get a qualified electrician to look at your Triton electric shower
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
£70–£200
Time on site
45 minutes
A start/stop switch is the cheaper outcome. A solenoid valve is the dearer one, and both are labour plus part rather than owner repairs.
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 Triton fault codes
- Low pressure indicator litUsually simple to fixA named Triton lamp with one meaning: pressure fell below what the shower needs, so it cut power to the elements and left the water running.Related: same brand
- Abnormal safety cut-out operatedGet it checkedTriton’s thermal cut-out is a one-shot device. It cannot be reset, and their own instruction is that an engineer replaces it after the fault is repaired.Related: same brand
- Water temperature cycling hot and coolGet it checkedTriton problem 3. The shower swings between hot and cool at intervals, and their published cause is the heater cycling on its temperature limiter.Related: same brand
- Shower goes cold during useUsually simple to fixTriton problem 5, and their published answer is one line: the water pressure dropped below the minimum, so wait until it comes back.Related: same brand
- TP temperature protectionUsually simple to fixTriton’s automatic temperature protection. It removes power to the elements when the limit is exceeded and puts it back on its own once things cool.Related: same brand
- Power on indicator not litGet it checkedThe neon in the start/stop button is a direct test of whether the supply has reached the shower. Unlit with the cord on points outward, not inward.Related: same brand
Own a Triton electric shower? Save it and its codes come first next time.
Related guides
Common questions
Is it dangerous if the shower will not stop?
It is not the same order of risk as an electrical fault, but it is not something to leave running either — the unit may still be heating. Pulling the cord removes the supply and closes the valve, which is why that is the first step.
Can the solenoid be cleaned rather than replaced?
Triton’s published remedy is replacement rather than cleaning. The seat and diaphragm are the parts that stop sealing, and once they are damaged a clean does not restore them reliably.
Which is cheaper, the switch or the valve?
The switch, generally, and it is also the easier of the two to get at. That is one reason it is worth noting how the button behaves before the engineer arrives.
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.