Shower cartridge failing after 9 to 12 months

[Trebor1]

Mira Silver EV shower cartridge fail.
Can anyone suggest why the cartridge fails after 9 to 12 months (starts to drip). Seal kit doesn’t work, tired of buying new cartridge at £130 a pop.
H/W is from a Combi boiler.

 

[Julie Street]

How old is the shower? Maybe time for a replacement?

 

[Trebor1]

How old is the shower? Maybe time for a replacement?

Hi Julie…it’s 10 years old but I don’t understand how a new unit would solve it. Apart from the cartridge the rest is just a housing with 2 pipes going into it ?

 

[ShaunCorbs]

Are you getting generic or genuine Mira cartridges if so I would go back to Mira

 

[John.g]

Dripping from Shower head?
Maybe hot/cold pressures (or HW temperature) exceed/borderline for shower spec?.

 

[Julie Street]

Hi Julie…it’s 10 years old but I don’t understand how a new unit would solve it. Apart from the cartridge the rest is just a housing with 2 pipes going into it ?

I know, I have been there myself and the only suggestions Mira could come up with were (1) limescale or (2) the valve body itself has a worn or damaged seating so after a while the cartridge doesn't seal anymore.
I'm still seeing 20plus yr old Mira showers only just starting to fail, but as with all manufacturers the build quality has gone down over the years.