Guest
Ooops, looks like the fill valve wasn’t closed tightly and the steam system became overfilled while you were gone. That hammering does a lot of damage and as you can now see; it will actually take fittings apart. For now, drain some of the water so the boiler level is 1/3 of the height of the gauge glass on the side of the boiler so the water doesn’t fill the upstairs pipes to continue banging.
