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Steam boilers don't have pressure on the gauge unless the burner has been running for a while to heat the water to build up steam pressure. The Utica site is down so I can't access any specs on your boiler. Does it have a wiring diagram glued to the inside of the burner compartment panel? Can you give me a clearly focused picture of it? or some good pics of the boiler and it's controls? Click on the ADD FILES link right next to the SEnD button to post pics here
One common culprit is a clog in the piping leading to the pressuretrol (the control with the adjustment screws) so tweaking it is probably what got it going. It will take quite a while for a cold system to build up pressure. In fact this time of year it's not uncommon for the thermostat to be satisfied before the boiler builds any pressure. If this happens again try unscrewing the pressuretrol (after you disconnect the leads) and clean out the pig tail and any other piping leading to it.