Hi all im Dean, this is my first forum. So not really sure how it works but here goes. I've just reinstalled an electric shower for the third time in the last 10 years. That's not the issue though. I've used the same make and model to make it easier for reinstillation. But for some reason it's not working. I've tested terminals and power is good. However when I press the power on the shower the light on the isolater goes off