I have had this same problem - it is due to an airlock in the boiler/tubes. Simple solution is to use a syringe or similar and gently force some water up the intake hose from the tank, then try the pump again.
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There are many possible points that the leak can be.
All points of the water supply from water tank to the pressure pump then to boiler and finally to coffee group. All this are connected together with plastic or Teflon pipes with easy fit unions secure with clips
Try this press the button for ground coffee then when it lights up press the coffee brew button, if water flows normally then the grind on the grinder needs to be adjusted coarser, if no water then the screen on the brew unit is blocked.
If the pump vibrates when trying to draw water then that is a good sign. Remo;ve the hose on the output side of the pump and turn it on to see if it draws water(BE Careful water and electricity love each other too much), it water flows out the output side, reconnect to boiler and test. If that did not solve the no draw problem then the machine is blocked either at the boiler.
Make sure your filter in the machine and in the filter holder is clean, the filter in filterholder there you will see a little light in the middle if you head it to light, else you have to replace the filter.