I installed a new Honeywell CT87K thermostat, and my heat will not shut off. I have hot-water baseboard heat. There are only two wires, and I have them in the right places (at least, I am pretty sure LOL!). There are two switches, and I believe I have them set correctly (only one option referred to hot water heat, so I selected this). My furnace is 40 years old, although I do not know why that would make a difference. I have two zones in the house, and the second one is operating properly on the other thermostat. I replaced the thermostat for this zone in November, and either it worked properly for a couple of months or it was so cold out that the furnace staying on kept the house at the correct temperature. Last week, it was apparent the heat was not shutting off and I replaced the almost new thermostat with a brand new one and the heat is still not shutting off... I can't believe that I have bought two faulty ones in a row! If this sounds like an installation error, what would be something I could change that could make it operate properly? All I think I can do is reverse the two wires and mess around with the switch settings... or, is there something else? I am TOO HOT and probably spending a gazillion dollars on gas! HELP!!!