Originally Posted by
RBP
So, I think I got it resolved. I played the recordings for the landlord and the boiler guy. The boiler guy said he had never heard a boiler do that before. He was messing with the valve controllers and at a certain point I went back downstairs and told him that the last thing he did recreated the noise, albeit more limited. So he did it again and again the noise.
He decided that the valve controller on the line to my apartment was malfunctioning and opening the valve too quickly which was causing a pipe to slam against other metal. He installed a new controller and so far, no more noise.