Okay so my boiler has been off for a while now because a pipe broke soo now the pipe is fixed and I went to turn it on and it started making puffing noises and began to get louder and louder so I turned it off because I didn't want to break or mess up anything and I went about my day and the next day I went to go turn it on again to see if it would work and when I turned it on it started smoking white smoke idk what's wrong with it and I don't wann let it just run because I'm afraid of ruining it can some one explain what's happening and possible give me tips or a solution