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My selectronic goes straight to L and switches off?

Hi I have installed new PRV and when I start the shower it runs but then after couple of seconds goes straight to L and turns off. Any ideas ?
Spencer, August 2017
This outfit are frequently a useful source of advice:

https://www.showerdoc.com/shower-spares/redring

You'll need to know your model a bit more exactly.

Acp, August 2017