The brew head leaks whenever the machine is on?
My machine worked fine and then was inactive for about a year. (Not exposed to extreme temperatures. The machine still works but the brew head leaks a lot of water.
The valve spring probably just needs to be retensioned; give it a good stretch, make sure the silicone valve nipple and seat are clean and put everything back together.
Check the o ring where the filter holder locks in is not missing or damaged. If its there take it out and clean the o-ring and the groove it sits in thoroughly. Also ensure there is no coffee residue on the top edge of the filter holder.
Too much coffee or too fine a grind can also cause this problem
This unit is likely the same as the Rio Vapore - HERE is the manual
Page 28 - troubleshooting may assist
These GUIDES may also be useful
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