First Selectman Kevin Moynihan has approved an emergency order for a Danbury-based company to fix a failing boiler at New Canaan Police headquarters, officials say. The boiler was leaking and emitting carbon monoxide into the South Avenue structure, according to Bill Oestmann, superintendent of buildings with the New Canaan Department of Public Works. It’s one of two boilers at the police station, which originally was the first New Canaan High School when it opened in 1927. “The one boiler is carrying the building for the moment,” Oestmann told members of the Board of Selectmen during their regular meeting, held Tuesday via videoconference. “We’d like to make this repair to reseal it before it gets too cold.