Hi, I need help. My Hayward heater after starting, is making a very loud just like an explosion noise. It is sounds like there is propane accumulating and then explodes. I don't know what could be wrong. I had checked by pool company and they said that it is propane company fault. I had the gas company come and they did cleaning and inspection but they said that there was no problem with it. Did anybody had similar problem? Can somebody suggest something? I'm thinking about buying a new heater but I don't want to spend money and still have the same problem.