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The wand can leak if the rocker switch is not in the UP position.
In MIDDLE position it will try to deliver hot water.
In DOWN position it will try to deliver steam.
The thermoblock in this unit is actually a 3-way valve, of which two positions route water from the boiler directly to the wand. The 3rd position (UP) routes hot water (but not steam) from the boiler to the group head.
Try holding the switch in the UP position by hand when making coffee. If the machine still pushes water through the wand then you will have to replace the switch inside the machine that is activated by the rocker, or the valve it operates.