Their are four posible reasons for above problem as follows.
First the Vibarating pump not creating pressure, usaly if here the sound it is pressing but not always. You can loose the pipe nut after the pump to see if you have any pressure after you press the coffee button. Be carefull with the water leaking.
Second the coffee solenoid valve that is on the grouphead might be stuck from dry coffee, it can be removed and cleaned with hot water and a wire brush.
Third the coffee group shower and inside round dish might also blocked from dry coffee, remove it and clean it.
Finnaly the more difficult problem might be that boiler-thermoblock is full off scale. So you must remove and descale the thermoblock boiler and the copper pipes to them.
This problem is the more difficult to be performed however if the water you have use was very hard then this is the most posible.
Good luck,
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