Shower won't switch off - calling PigletJohn

[MikeUniformMike]

The shower is pouring water, even though I switched it off and switched the power off.
I have turned the water off at the stopcock so it's not running now.
Is it something I can fix myself or do I need to get a new shower or call a plumber to repair it?
It might be a coincidence but I had a new central heating boiler fitted yesterday but I think it was dripping before.
The shower is a Triton T80si.

Sorry, just realised that I failed to say please.
Also, would it be better to replace the shower and is it something I could do myself?
Thanks in advance.
MUM

is it an electric one or a mixer?

bar or round?

photo would be good.

Is it leaking from the box or the spray head?

oops, a Triton T80si. so electric

Not worth repairing.

Get a plumber of a qualified electrician to fit a new one.

Look out for a service valve which with a bit of luck will be fitted in the supply pipe to the shower (and if not, certainly get one)

It probably looks like this
www.screwfix.com/p/isolating-valve-15mm-10-pack/32802
less than a pound each, and it shows. Sometimes they leak for no reason.
but fit one of these which are much much better.
www.screwfix.com/p/pegler-tee-ball-valve-blue-15mm/21860
and you can turn with your fingers

PigletJohn. Thank you for your reply.
The shower isn't AFAIK leaking, it's just behaving like a tap left running. Water is coming out through the showerhead but not anywhere else.
I think it might be the pressure control valve, which would be less than £10 to replace.
Does that sound likely?
I don't wish to spend £££ unless I have to. I haven't got £££, I've just had a new boiler fitted.

I couldn't find a tap to switch off the water supply to the shower. Might there be a valve? Sorry for being a bit thick, but if there is a valve how do I switch off the water supply to the shower?
At the moment, I am making do with turning the main stopcock off other than when I have to.

If there is a valve in the supply pipe, it is most likely like my first link, and you use a medium flat screwdriver to turn the screwhead so it lies across the direction of the pipe. It only needs a quarter turn between on and off.

Thanks, I will look.
The shower is over a bath so it might be behind the bath panel.
After I posted, I came across this:

What do you think? Thanks again.

I would expect the PRV to squirt out of the bottom of the shower box, not from the hose or head.

OK. I asked for your opinion and you are saying Buy a new shower and get it properly installed.
From my 'research' I'd guess that it's the solenoid valve or the pressure control valve but I'm not sure I'd be up to replacing them.

Any suggestions as to what I would replace it with, please? The one I have has been ok until now and is about 15 yrs old.

I looked up the solenoid valve assembly (££) and I think you are right. Thank you PigletJohn.

15 years is a good lifetime for an electric shower.

It is usually simplest to swap for a similar model from the same maker. With luck the pipes and fixing screws will be in the same positions. The maker probably has a help desk that will be familiar with the question.

Assume the same power as your old one. A competent electrician can assess the capacity of your existing cable to see what load it can safely carry. The cross-section is the first aspect, but the route may affect the cable capacity.

found a sample price on here, it is a pumped shower so more expensive than most.

Wow. Thanks for the reply PigletJohn. Should I order it and find a plumber to do it asap?
How much, roughly, would the electrician cost? (Callout charge+hourly rate x time to fit in hours?

Electrician not plumber.

If it is a straight swap I think it would be expensive if she charged more than £100. Use someone local who will not charge lots of travel time. Some may have a minimum charge in the region of £60.

You can look up electricians who are members of a Competent Persons scheme on such organisations as NICEIC

Look for one local to you who has been in business for some years and is not just a Domestic Installer (this is the lowest grade)

Also, it just occurred to me, since your shower is unusually expensive, it might be worth asking the makers if they offer a repair or replacement service. Only worthwhile if it has a good guarantee. Ordinary electric showers are cheap enough to be a throw-away item.

Thanks, PigletJohn. I have contacted several sparkies and the ones who replied say it's a plumber's job. I can get the same model for about £90 and it will be about £75 for the plumber. Thanks for answering.