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My boiler is not firing. I have everything on, I set the thermostat to 80 (just to get the boiler started), the circulator pump is running, I filled the boiler to a pressure of 10PSI but the boiler won't fire. The pilot light is on. When I turn my basement thermostat on the boiler fires, so I got the boiler temp up to 180. But then I turn that stat off and I am trying to only run the main zone and again the circ pump is running nicely, but the boiler is not firing. I suspect it is the settings of this aquastat, which appears to be set to zero. How do you set a boilers aquastat? I don't know what the numbers under it are (the 5 to 45 ones). I am reluctant to change anything here until I understand to avoid danger. Please advise.