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kevplumb said:let the air out of the ev and see if you get water out of the valve if so ex vessel is dead
Did that, no water before or after pressurising. Have the system on now and after going through old posts i have loosened the black nut whilst the heating is on. I left it for a while with no sign of water, but it was rattling about as the spindle was spinning so i tightened it up as to avoid any damage. What exactly should i be doing and what results should i expect to make sure there is no air in the pump?