Mira Excel Mk.2 (96-03) leaks behind wall, when shower is on

[Autechre]

Hi,

I really need some help to stop a long-term leak from my Mira Excel Mk.2 shower.

It leaks behind the wall, spraying water in the gap between the plaster board and wall, but only when the shower is used. The water has pooled on the floorboards under and behind the tray and rotted the skirting board by the side of the tray, creating a large gap that I now use to stuff a towel behind the wall to soak up as much water as possible - but not enough.

No water leaks are visible from the 'bathroom' side, although the main body of the shower unit has been additionally sealed to the shower tiles with silicone sealant, so I don't know if water would also spray out into the shower cubicle, if the sealant wasn't there. The water that leaks is quite warmish, but I can't tell whether it's purely from the hot water side (cooled by the time I wring out the towel) or a mix of hot and cold.

The pipework is concealed.
No problem with turning shower on or off, or varying the volume of water.
Power/pressure is fine.
Temp range - cold to very hot - is fine.

Do I need a new cartridge assembly or can I hopefully get away with some new seals?

Thanks.

Picture from showerdoc.com and shower-spares.co.uk.

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[Autechre]

I know it sounds like I don't need as much help as others, but I do.

I'm a regular DIYer and still have the instruction manual, so I can replace what needs to be replaced, but I don't want to try every kind of fix until I find the right one.

I'd love some professional advice.

Thanks.

 

[sime10]

If it only leaks when the shower is on its got to be down to the tiling unless its constant

 

[Autechre]

The tiling was added after the unit was fitted about ten years ago, so I don't think it can be the cause.

I found this posting
//www.diynot.com/forums/viewtopic.php?p=1481098#1481098
which sounds like a similar problem, but I don't quite understand the solution.

Could replacing the seals "B" fix the leak? I don't relish £100 for a new cartridge.

Cheers.