How can I fix no water from my Triton Amber3 electric shower?

Hi,
I have a Triton Amber 3 electric shower. I have no water and replaced the solenoid as this has fixed the problem before. Sadly this hasn't helped and there does not seem to be a leak anywhere. All the wires seem to be in good order. What can possibly be the problem or is my shower too old and needs to be replaced?