boiler will not shut off

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Our boiler will not shut off, even after putting a new thermostat. The boiler is a type D Weil-Mclain Gas boiler, one zone. I am thinking since when i put the thermostat well below room temperature and the burners do not shut off I am going to replace the high limit and circulator control, would this be the right idea?? My only other idea is that it could be something wrong with the main gas valve, which hooks up to the thermostat. Thanks for all your help, I really appreciate it.