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I have a rancilio z11 espresso machine it is acting up I at first though it was the fill rod in the sight glass as the machine shut down because it had to much water, would not make steam so i drained and turned back on and I have been watching the water level, the level in the sight glass goes up slowly (if you are not using the machine) however the pump does not come on. If you pull a shot of espresso the pump comes on a goes off as soon as ths shot is finished.. I have also noticed if you steam something when you are done steaming you can watch the water level drop if it drops below the bottom of the rod the pump comes on but again goes off when it touches the bottom of the rod. Any ideas what would cause this any help would be appericated thank you Kathy