Sage - Powerboard PCB
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If you have already replaced the solenoid valves and the machine is still not letting any water out of the group head, it could be because the main board has a problem.
You can test this with a multimeter. When you brew, the left hand solenoid valve (looking from the front of the machine) should be getting 220v.
If it's not getting any voltage the problem is usually the main board.