When was it last serviced ? When things start to go south they can get bad in a hurry , and a furnace that ' s been left unloved too long can have a multitude of issues , clogged nozzle , shortened electrodes , dirty flame sensor , weak transformer , etc . That being said , after a certain number of cycles without ignition the unit will probably always hard lockout . You might not have bled it quite enough , or had an air bubble trapped in the line . If it came back after a single power down reset and is running ok now you ' re probably fine . Oh and change your dang fuel filter every year . Water is hell on heating equipment . <| sep |> I dont think a whole family can have the same s 2 . I honestly would prefer the AOE silences to this simply because if water sea emp doesnt have an aoe s 2 his despair cc capabilitys are kinda poor