I have a Utica oil burner with an expansion tank. I have hot water to the point it is scolding but I can not get any hot water in my heating pipes. I Have 4 circulators. They run hot and I can feel hot water past the circulators but if I move my hand a few feet I get cold pipes. I have opened my valves to see if I had air but it was air free... anyone know what's wrong?

The circulaters can not be working