Chris

I guess the solenoid or the inlet valve within the shower casing could be faulty. If they don’t open fully when you turn the shower on that might trigger a low pressure warning. If you have cover from the manufacturer they’ll just send someone out who will probably just replace the entire internal guts (in my Gainsborough it’s called the “shower engine” - I’ve replaced it myself a couple of times over the years. In my case it’s the heating element that always fails first).