I have a Sta-Rite Max-E-Therm 333 heater natural gas. I have a really off problem with it. It works great and heats awesome till it hits the set temperature and turns off. It is unable to restart after that. It will buzz and buzz it knows it should be on but will not light. If I unplug it for about 2 to 4 hrs and plug it back in it works great till it reaches the temperature and turns off again. When it tries to light the blower is running.. I am an election so you can give me tests to run that would be great.Anyone know what could cause this?