I am trying to set the heat to come on at 1:00 am. It is a large area of our church with hot water heat. The thermostat just ignores it. I found out today that it will work with 3:00 am setting. I have not tried the other days but they are possibly doing the same thing. I have no need for the others (5) to come on that early. Is there some limitation that I don't know about? I would appreciate any help on this subject that I can get.