IridiumBlackberry I think you need to manually prime the pump through feeding some water through the tube, if I am not wrong. @DavecUK will confirm. The below steps are reproduced from the Leva FAQ doc. Please let Dave confirm if priming is required and below steps are correct.
Priming the pump
Upon taking delivery of the Evo Leva, or after a period without using it, it might be necessary to prime the pump. The usual symptom is that when turning on the machine, the pump makes a buzzing sound as if working but without drawing any water from the tank (After a while you’ll get an AL 10 error). Priming the pump can be a bugger to do, but @DaveUK suggests the following steps (which others have confirmed to be quite easy):
1. Pull off the gauze filter on the water inlet tube
2. With the machine switched off, pull the lever down
3. Use the switch to start/stop the pump and squirt some water down the inlet tube to fill the pump as the pump is running
4. When it picks up, stop the pump, fill the inlet tube with water, pop the gauze filter back on and drop it in full in the tank