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I'm a homeowner, moderately knowledgeable about our steam heat system in our old house, but still learning. I'm having a strange problem. The system is building up enough pressure to be forcing air past the radiator valves (far more pressure, I think, than I want), all of the radiators are burning hot, but the system won't cut off (unless I turn the thermostat down). Meanwhile, back at the furnace, the 15psi gauge (I know i should install a lower range gauge) hasn't budged off the pin, and the pressuretrol is already set at its lowest cut-in -- 1/2#. So I figured both the gauge and the pressuretrol stems were probably clogged and/or busted, so I called my steam guy to come take a look. He changed out the pressuretrol and left thinking everything was fine, but the system will still only cut off via the thermostat. It doesn't make any sense to me that the pressure could be low in the boiler but high further up in the system -- so...stems clogged again? Thoughts?