This should be a fairly straightforward issue but I am having trouble getting my hands around it. I had a manual round thermostat and decided to upgrade to an electronic timer type. I purchased the Ritetemp 8050c. I have 2 wires coming out of the wall - Red and Black. No Air Conditioning or Heat pump - just an oil furnace with circulators. I used the diagram that showed 2 wires and connected the red to RH and the Black to W. There is a jumper in the thermostat between RH and Rc.

My problem is that the temperature stays too high. During the day when I have it cut back to 62 degrees I am in the low 70's on the thermostat temperature. If I go to the burner I can hear a humming from the circulator and the pipes are hot so I am wondering if somehow I am running the circulator even though I set it back to 62 degrees.

Any ideas?

Thanks for the help.

Can you get at the connections at the furnace when the circulator is running when the thermostat isn't calling for heat? If you have power between the black wire and the opposite terminal of the transformer from the red wire, the thermostat isn't working right. If the furnace is running when the black wire doesn't have power, a relay may be stuck. It may have decided to stick about the time you changed the thermostat.

Thank you for the quick response. Of course the control box for this circulator is behind the furnace and is rusty and filthy on the outside but I will get back there with your instructions...