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Lots of water exiting through main line vents
What is going on!! Both main line vents have water running out of them. It's a single pipe system with main line vent located at the end of the return lines. We are having the chimney cleaned and it just started pouring out while he was vacuuming the chimney. The boiler had just start running we he arrived and we shut it off by throwing the shut off switch, maybe that cause it. But the oil company always shuts it off that way when they come to clean the burner without ever having an issue.