Hi Graham, my engineering skills are legendary! If we start at the start the machine has not been used for some time. SO, as Adrian asked, did you empty the resevoir and boilers. If you did, all fine and dandy. The first thing the machine would do on turning on is sense no water. So, if you fill the water tank up and turn on then the pump ought to draw water into the boilers. If you did not empty the water from the boilers and tank, turn her on and let her heat up then draw as much water out as you can.
At this point, someone who knows what he is talking about can take over!