Boswell is right on manuals from hobart you can't get them. I'm at a lose if it's doing that . If it is firing correctly for 3 days then stops could you gas valve be leaking by and and giving it a boom when it lights? What was the water leaking from? Could possibly the boiler be filled with scale over heating burner chamber I know I'm giving some strange what if's but I'm puzzled at what this units doing. I wish I had better advice.
Boswell It must be slow if Hobart lays off hate to hear you got laid off what area you in?