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Hi my name is ***** ***** I have been in the plumbing field for 20 years. I will be glad to help you today. Is there any error code displayed? What model Aqualisa shower is this and how old is it?
If you remove the cover, is there any water getting inside? During startup, does it turn on for a second then go into the fault or does it go into the fault right away?
I would say that since it is a newer model it very well may be under warranty. If you have cleaned the inlet screen and it surely has water pressure going to it then it very well may be a warranty issue. They will provide an engineer and parts in most cases. If it is out of warranty then we would want to test the solenoid with a multimeter to be sure that it is opening and closing the valve when it should.
Are you able to tell from this manual? Click here If not I will see if I can find another reference.
Check out page 20
Try some of the commissioning directions there and if pushing the piston on the solenoid does not get water through then either there is a blockage in the piping or the solenoid has failed.
I will be opting out and open this to other experts. Sorry for the delay.
It goes to the field of experts and there should be a response soon.