I working on a hydronic system Air handler with a DX coil & hydronic coil I have no heat. The boilers are lit and hot in the boiler room. The chillers are off. The pumps are not running. The blower are not running. I have no voltage at the T-stat, but I have 24 volts at the pup relay. When I jump out he pump relay the pumps starts. I can not figure out what's wrong