No hot water, the boiler wouldn’t heat. Checked the hot water tank thermostat. It was working fine. Tested taco zone boards, they were operating properly. I went through the taco mixing control. Found the warm weather shutdown was set at 68. I turned that setting off. The boiler turned on and heated the hot water tank. The boiler is operating at this time. I recommend having maintenance done on the furnace, air conditioner and boiler.