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thanks for your advice, both the t stat, its wiring, and the pressuretrol were new and functioning properly. after skimming the boiler, again, and after it got a month of solid use, it started working again. i don't know why, but i will let the steam demons be. thanks again. by the way, the...

when the thermostat asks for heat, the boiler fires, but only for about a minute or so; then it turns off. it slowly builds up enough pressure to heat the second floor, but the third floor stays stone cold. the pressuretrol is set for 5 psi, but it never builds up enough pressure. the boiler is...