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williamson steam boiler not working? Need help

I have a one year old Williamson gas fired steam boiler that was in the house I just purchased. It was working well for a week before the system stopped. When you jump the two thermostat wires the system starts and works fine. It had the old t87 round thermostat which I changed and still did not work. I changed the thermo wire all the way to boiler and still not working unless I jump the wires. I then changed the 24V transformer-relay and the same problem. I was getting low voltage readings before I changed transformer and now after the change readings are normal but system still does not work if I don't jump the wires. I don't know what the problem is????? 
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