[Rfroen]

I volunteer at a historic building that just installed a new smith steam boiler (GB300-S/W-9INT) late last spring. When the thermostat calls for heat, the boiler lights, burners run for almost exactly one minute, the boiler shuts down, there is a 10-15 second pause ... and then the boiler lights again. This cycle continues dozens of times in succession until the thermostat set temperature is finally reached. The HVAC techs who installed the system have replaced all the electronic controls more than once and it still does the same. (Warranties only cover parts replacement. The labor is mounting to nearly $1000 and it still doesn't work.) As we say in Minnesota, Uff Da!
The previous boiler just ran until the temperature reached the thermostats set point and then stopped period.
Any suggestions if the boiler controls were installed correctly in the first place or what the problem could be?
Thanks!