I received this unit used as a gift and it worked great. One morning, same issue as everyone else had started. No water from main head but steam nozzle worked. Long story short, I let the unit heat up. Completely turned the unit off to stop the pump from engaging, and turned the knob for the steam nozzle on. It purged for a few seconds and stopped, I assume releasing the pressure in the line. Turned the knob back off, turned the unit back on and tried to brew a cup like normal and the issue was fixed. This was caused by letting the resoviore run dry while the pump was still engaged. Old post but It was the first I found while trouble shooting.